Bad service at kfc

I am a regular customer at kfc that buy weekly meals for my family.I did a online order at kfc promenade drive thru and when I got the food it was so slimy and bitter that it almost tasted soapy.My mom actually got sick the next day and had a runny tummy.the very same day I called the store and spoke to a guy that claimed to be the store manager and I explained to him what has happened and his reply was I will reimburse u with a streetwise 2 which was actually embarrassing because he made me feel like I was calling for a free meal.My mom spoke to him and was furious for the old food they were selling and he then said he gna get back to us and he never did.I then called their head office about a week later cos I went to their blouberg store thinking I wouldn’t experience this in a area like that but it was even worse cos the chicken was blue and stiff and u could c it was old.I sent it back and they just sent back food that was the same.i was so furious that I just walked out.I have called the head office numerous of times and have spent so much money on airtime and have spoken to 4 different people already and then I get promised to be contacted and nothing.I feel like the staff in promenade is *********** and the service is really bad.