KFC review: Service

I was at the kfc in south chicago heights illinois on saturday with a voucher and order, then the supervisor gab the voucher rudely from the cashier, was gone for several minutes and came back stated I was not able to use the voucher till the manager came in about 4pm and this was about 2pm and to please come back, I ask for her name and store # which she stated did not have one, ask for manager name and she wrote it down, it was diane, that per was very rude and per the faces of the other employee new that this was not right, my voucher was not accepted and was refused service also stated not manager on duty, this is not acceptable very back customer service