Uneducated staff: product knowledge

hi on the 26 December 2017, my husband and I decided to go the movies with nothing much to do after Christmas. so at 8:30am we arrived at Ster-Kinekor Musgarve Durban to watch an early show which was Jumaji, we used our club cards to purchase half price tickets no problems and watched the movie. in the evening my husband and I decided to bring my nephews to the movies to watch STAR WARS, get to Ster-Kinekor Musgarve Durban to purchase tickets with our club cards I was told sorry one of my cards does not work. so how is this possible I asked the cashier who asked the supervisor who asked a manager avinash I think his name was? in all this time I was asked if I was sure I used the cards in the morning, despite having shown these clowns my slip of purchase with a ref number of the transaction from the morning. the manager disappears to check the transaction, after waiting and having my nephews impatient about getting good seats, I had to purchase full 4 full price tickets costing me R332.00. between the cashier supervisor and manager I could not understand their confusion, if my information was on the receipt, they kept asking me when last did I use the card???? like duh I used my card in the morning with a receipt as proof and if they had video footage they would have seen my husband and I their in the morning. I am very disappointed with the lack of service from the staff who could not help and stood there looking at me like I was wasting their time and the cashier tell eish move aside so I can assist people who don't have your problem, FYI IT WAS NOT MY PROBLEM IF STER - KINEKOR COULD NOT ASNWER ME WHY THE CARD WORKED IN THE MORNING AND NOT THE EVENING. It seems ster-kinekor club card is a ****, and people should be aware of this and the lack of customer service from the staff!!!!!