Rotten Chicken at KFC Protea Glen

I went to KFC Protea Glen this afternoon during my lunch break,when i got there i ordered a bucket for 1 and when i sat down to eat my food there was a strange smell. The chicken had a bad smell and when i removed the skin the chicken had a grey color and smell and it looked raw but at the same time it had a rotten smell. When i went back to KFC the manager seemed unbothered and even didn't seem like he cared. He offered me more chicken, he doesn't even check the meat or say he'll investigate, i told him i want my money back and he offered me free ice cream as if that's a solution. His not concerned about the state of his food and that its rotten but he just wanted to get me out of his shop. He didn't even check the meat or even taste it but he wants me to have some more. Now i went to the doctor because i am scared of getting sick, i am really not happy with their service and the fact that he seemed unbothered worries me because which means he continued selling this chicken to other people and doesn't seem to care because he won't have offered me more chicken.