Disgusting Service - Staff Needs to be replaced

Yesterday evening my girlfriend and i walked into KFC at the Chatsworth center upper about 17:00pm and i stood and watched how a customer that just left the premises being insulted. Firstly the staff that was cashing was wrong for she never capture the customer order correctly and there was a difference that the customer needed to pay and the attitude that the staff asked the lady for the money in was disgusting. All that staff mocked this woman when she walked out and i was totally angry at this. I have also have many bad experience at the drive thru with the same KFC and when i drove off i am not sure what attitude they displayed behind my back. The cashier firstly it was her fault for she captured the customer order wrong and the she gives the customer attitude, doesn't she know that customer pays her salary? This really show the poor management at KFC.