Sometimes you just gotta suck it up and accept that nothing is perfect in life. Who knows where the chicken may have gotten tainted, may not be any fault of Toyota Center at all. My wife recently got sick from KFC, but we didn't want anything free from them, we didn't even tell them. Probably should of though, let them investigate.
Unfortunate that they go this far just because they are doubtful about losing a card worth only $15 to them.