You have a default gateway in the router? Post your export config
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I have two pptp at PCC (dual wan) configuratin, so, there must be something in your configuration. As c0d3rSh3ll said, post your export and we can see.
delete username and pass from export 
On Monday I will export my working setting (2xWAN with PPC balancing + PPTP Client) if you can.
Comment:
RB is RB532A with two wifi (wanX & wanI)
wanI is iPhone with tethering
wanX is Android with tethering
On RB is also transparent proxy. I exported some important sections.
Both phones have DHCP but I set IPs directly to RB because problem with “distance” in default routes.
Everything working fine if you use just one wan (Android stay and iPhone leaves room or iPhone stay and Android leaves room. If connected both then WAN is balanced between both of them). PPTP is working too but sometimes disconects and reconects - I think that becuse one of wan goes away and connection is established thru leaving phone…
/interface bridge
add l2mtu=1600 name=local protocol-mode=stp
/interface ethernet
set [ find default-name=ether1 ] disabled=yes name=WAN
set [ find default-name=ether3 ] name=inside
set [ find default-name=ether2 ] name=server speed=1Gbps
/interface pptp-client
add allow=mschap2 connect-to=X.X.X.X disabled=no name=pptp-XXX password=xxxxxxxxx user=xXxx
add comment="XXXX XXX" connect-to=X.X.X.X disabled=no max-mru=1460 max-mtu=1460 name=pptp-out2 password=xxxxxxx user=xxx
/ip neighbor discovery
set pptp-out2 comment="XXX XXX"
/interface wireless
set [ find default-name=wlan2 ] adaptive-noise-immunity=ap-and-client-mode antenna-mode=ant-b band=2ghz-b/g basic-rates-a/g=18Mbps,24Mbps,36Mbps,48Mbps,54Mbps country="czech republic" disabled=no \
disconnect-timeout=15s frequency=2412 hw-retries=15 l2mtu=2290 mac-address=00:0C:6B:58:22:02 max-station-count=100 name=wanI on-fail-retry-time=500ms radio-name=xxx security-profile=iPhone4 ssid=10C_Vekys \
supported-rates-a/g=18Mbps,24Mbps,36Mbps,48Mbps,54Mbps supported-rates-b=1Mbps wireless-protocol=802.11
set [ find default-name=wlan1 ] adaptive-noise-immunity=client-mode band=2ghz-b/g basic-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps country="czech republic" disabled=no distance=indoors frequency=2437 hw-retries=15 \
l2mtu=2290 mac-address=00:0C:42:2B:7E:00 name=wanX nv2-preshared-key=jobber5963 radio-name=000C422B7E00 security-profile=SONYmobil ssid=10C_mobile supported-rates-a/g=6Mbps wds-mode=dynamic \
wireless-protocol=802.11
/ip pool
add name=dhcp_pool1 ranges=192.168.69.50-192.168.69.200
/ip dhcp-server
add add-arp=yes address-pool=dhcp_pool1 always-broadcast=yes authoritative=yes disabled=no interface=local name=dhcp1
/ppp profile
set 0 change-tcp-mss=no
set 1 use-compression=yes use-mpls=yes use-vj-compression=yes
/interface bridge port
add bridge=local interface=inside
add bridge=local interface=server
/interface pptp-server server
set enabled=yes max-mru=1460 max-mtu=1460
/interface wireless access-list
add comment="Sony Experia Tipo" interface=wanI mac-address=D0:51:62:69:DD:8D
/ip address
add address=192.168.69.1/24 interface=local network=192.168.69.0
add address=192.168.43.177/24 interface=wanX network=192.168.43.0
add address=172.20.10.11/28 interface=wanI network=172.20.10.0
/ip dhcp-client
add default-route-distance=0 dhcp-options=hostname,clientid interface=wanX use-peer-dns=no use-peer-ntp=no
add dhcp-options=hostname,clientid interface=wanI use-peer-dns=no use-peer-ntp=no
/ip dhcp-server network
add address=192.168.69.0/24 dns-server=192.168.69.1,8.8.8.8 gateway=192.168.69.1
/ip dns
set allow-remote-requests=yes cache-size=4096KiB max-udp-packet-size=512 servers=8.8.8.8,8.8.4.4,192.168.43.1
/ip firewall mangle
add action=mark-connection chain=input comment=wan_Xperia disabled=yes in-interface=wanX new-connection-mark=wanX_conn passthrough=no
add action=mark-connection chain=input comment=wan_Iphone disabled=yes in-interface=wanI new-connection-mark=wanI_conn passthrough=no
add action=mark-connection chain=output comment=wan_Xperia dst-port=80 new-connection-mark=wanX_conn per-connection-classifier=both-addresses-and-ports:2/0 protocol=tcp
add action=mark-connection chain=prerouting comment=wan_Xperia dst-address-type=!local dst-port=!80 in-interface=local new-connection-mark=wanX_conn per-connection-classifier=both-addresses-and-ports:2/0 \
protocol=tcp
add action=mark-connection chain=output comment=wan_Iphone dst-port=80 new-connection-mark=wanI_conn per-connection-classifier=both-addresses-and-ports:2/1 protocol=tcp
add action=mark-connection chain=prerouting comment=wan_Iphone dst-address-type=!local dst-port=!80 in-interface=local new-connection-mark=wanI_conn per-connection-classifier=both-addresses-and-ports:2/1 \
protocol=tcp
add action=mark-routing chain=prerouting comment=wan_Xperia connection-mark=wanX_conn dst-address=!192.168.0.0/16 in-interface=local new-routing-mark=to_wanX passthrough=no
add action=mark-routing chain=prerouting comment=wan_Iphone connection-mark=wanI_conn dst-address=!192.168.0.0/16 in-interface=local new-routing-mark=to_wanI passthrough=no
add action=mark-routing chain=output comment=wan_Xperia connection-mark=wanX_conn new-routing-mark=to_wanX passthrough=no
add action=mark-routing chain=output comment=wan_Iphone connection-mark=wanI_conn new-routing-mark=to_wanI passthrough=no
add chain=prerouting comment=wan_Xperia dst-address=192.168.43.0/24 in-interface=local
add chain=prerouting comment=wan_Iphone dst-address=172.20.10.0/28 in-interface=local
/ip firewall nat
add action=masquerade chain=srcnat comment=wan_Xperia out-interface=wanX
add action=masquerade chain=srcnat comment=wan_Iphone out-interface=wanI
add action=redirect chain=dstnat comment="Transparentni poxy http" dst-port=80 protocol=tcp to-ports=3128
/ip proxy
set always-from-cache=yes cache-administrator=G-d cache-on-disk=yes enabled=yes max-fresh-time=1w parent-proxy=0.0.0.0 port=3128
/ip proxy access
add action=deny comment="block telnet & spam e-mail relaying" dst-port=23-25
add action=deny disabled=yes
/ip proxy direct
add dst-address=0.0.0.0/0 dst-port=443
add dst-address=192.168.69.1 dst-port=80 src-address=192.168.69.0/24
/ip route
add check-gateway=ping distance=1 gateway=192.168.43.1 routing-mark=to_wanX
add check-gateway=ping distance=1 gateway=172.20.10.1 routing-mark=to_wanI
add check-gateway=ping distance=1 gateway=172.20.10.1
add check-gateway=ping distance=2 gateway=192.168.43.1