pppoe server

hello
i have rb433 mikrotik board that authenticate whit radios server( radios server have two panel for two different company)
mikrotik board have many vlan and i want to set different default gateway in each vlan (when a pppoe user connect i cant tell him go to which vlan but i have tell him use which default gateway )
i use pppoe server but i dosent work .
how can i do to set two different default gateway in pppoe server?
thanks

actually i want to set 2M for company a and set 8m for company b ,now all pppoe connect together and in a same vlan ,i should set different gateway for each company after that i can limit two company .

hiiiiiiiiiiiii
is not anybody help me?