Off chicken from mochachos

Bought a full pack chicken family meal., with 2 burger meal

I opened up everything, and min we took out chicken I could smell something that could be described closest to a child's diaper. I broke a piece of chicken smelt it, it was off. My mother almost threw up. I called the manager and he told me its USUALLY made fresh.

Was the cook sleeping? Could he not tell the chicken was off. We didnt want another chicken from there incase we got sick, as we were all sick recently with flu. We took our money and went straight to nando.