limit holdem hand question please advise

[lilkunta2]

.50/1 game on party

i posted in late posiion and got 2-7 off suit

on limper in front, i check, 2 more limpers behind,, sb folds bb checks

flop is A-2-7 rainbow

BB bets out,,, first limper folds,,, i raise,, the other limpers fold and the BB calls

turn is an 8

BB checks, i bet,, and he raises me.

whats the right play here? do you fold? or do you call,,, then call again on the river unless an ace or an 8 hits?