Not much you can do in that exact example, but fold. In a cash game, unless you have a great read on a maniac, not many players are going to be pushing AI w/ TPTK unless there is some scary coordinated board and they want to take the pot right there. If you had A8s and flop gave you TPTK and nut flush draw, that call may very well be correct.

But, you said you can never put them on a hand because they limp- well you can control the pot and get control of the hand by raising preflop. And you can buy information on the flop by betting and re-raising your opponents. You are not powerless. Calling stations are wonderfulf due to the fact that for every time they suck out on you you will make back that money and more when you hit a huge hand b/c they will keep up their calling ways.