Bad bad bad customer service and attitude

I went to Pick n pay orange farm old one by Build it. I did my convenient weekly shopping which was about R380.. when i tried to pay using my standardbank incentive card I was advised that I cannot as its not signed. I advised them that this is a staff incentive card that i am always using even at that same store. i was told that I will not be helped , i asked the supervisor(sarah) to assist and she refused point blank and kept on rolling her eyes when i was talking to and ended up asking for the manager, sho took 30 minutes to get to me and the guy by the name of Themba finally attended me. he said that people like me de***** their store and i ttook out my drivers licence as from of identification and asked him to validate and he refused told me that he will not assist me , then i asked him that he borrows me the pen to sign the card as thats the problem with himHe ALSO REFUSED. thiese guys where not willing to help becasue i asked to validate me while im in the shop becasue i have positive identification with me and they refused. this was just bad customer service that we keep on getting especially from the stores in the township.