When I took them back, I didn't make a fuss, just asked for an exchange so I could safely eat what I planned to eat. They didn't have the same kind, when I asked for slightly differently prepared chicken kabobs (no marinade vs the ones I had were marinaded) they asked I pay the difference between the two. I didn't think that was kosher, after all it wasn't my fault that their product was misdated and they couldn't offer me an exact exchange. Admittedly, the difference was only four dollars (for the same friggin weight of chicken! love those price fluctuations) but the onus was on their side not mine. Finally, after going back and forth with the counter lady for a few minutes, she rolled her eyes, deleted the purchase and said "just take them".
As she didn't give me a reciept, I'm assuming that the exchange wasn't recorded either.
Yes I did eventually get a fair trade, but it wasn't through an automatic effort of their customer service policies. I would suggest people keep an eye out for the "sell by" date when they shop there.