Manager swearing at customers

We went to KFC tonight and to our suprise this trip was horrific. After ordering and paying we proceeded to the next window to collect our food. The lady read our order out loud and we corrected her by saying we ordered a fanta as well after a huge argument we eventually asked her to leave the fanta and just give the rest of the order. When receiving our food there was one meal missing. We tried explaining this to her but it proceeded to a whole misunderstanding. We then asked for the manager. After telling the manager our order and that the lady at the first window had taken the wrong order things got very heated. After a huge argument with swear words flying around the manager eventually told us F#CK YOU too.

As my occupation consideres 90% of client contact I know this is unacceptable. I cannot believe this is the service we got. After complying with the first mistake they made with the fanta and accepting the rest of the order I did not expect this. Its disgusting. You should never ever talk to clients in this way. After all its the clients that pay our salaries. Without clients theres no business. Well sone KFC Discovery you just lost us as clients. I am disgusted.