vlan bonding

hello i have a config that i need help with, not sure if it is even possible to do but here goes.

my service provider is giving me 7 MB of bandwith but is doing so with 2 different vlans, he gives me the service over cat5 but when i configure the MT i have to configure two different vlans to get the full 7mb like as if i had a dual wan, is there anyway that i can consolidate this into one stream or will i have to treat it as if it was 2 different interfaces?

thanks

You can us load balancing
http://forum.mikrotik.com/t/new-firewall-matcher-pcc/28077/1