Bad experience at KFC

I recently experienced very bad service from the KFC in Springfield Park, Durban. What happened was, I went to get the 8 piece family treat meal for my family, for supper, I was then told that they do not have burger buns, so I am unable to get the snack burgers, the replacement will be a mash and gravy, as this is not a meat replacement I chose to take the 10 piece family treat, (instead of the 8 pieces), therefore costing me more money, I then asked for an oreo krusher, I was then told that i cannot get that as well, so i took the meal and went home to have it, only to find that the coleslaw did not taste fresh, it was in fact sour. I proceeded to call the customer care center and was told that the manager from the branch will call me to discuss the matter and try to resolve the issue, I waited until the next day, i then received a call to find out if someone did call me, then when i said no, i was told that they will definitely get someone from the branch to call me, 3 calls later to the call centre and i have still had no feedback from KFC to find out what happe6and how to resolve or even compensate me for what had happened, extremely unhappy customer.