half eaten lemon in krusher and rude, slow staff

Went to the drive through at about 2pm today. When we reached the collection counter we were told our food is not ready and we must go park. We refused as that defeats the purpose of using the drive through and we have in the past had to wait nearly 20 mins after parking. The attendant became rather rude. They had told us its a minute wait - we sat at that window for over 5 minutes - and that was with them rushing because a customer had been at the window for too long (can you imagine the wait we would have if we had parked). We had only ordered 3 krushers, two mini pops and a mini twister, it was not a big order that warranted such a wait. They forgot one krusher and became hostile when we refused to leave without it. After drinking my krusher I then discovered they had put an old half eaten lemon in my drink out of spite. I have never been so disgusted. I have taken photos and posted to social media to show people the sort of filthy unprofessional service and product one can expect from your company and employees. I will never eat at KFC again. Customers should not be subjected to such disgusting practice when they dare to insist on receiving the service your company promises us.