unsatisfied customer

Good day Hello Peter please assist, I'm in need of your help and advice. On Sunday (08 Dec 2019) I went to shoprite (Melody Walk, Mitchell's Plain) with my sister and 4 year old daughter. After almost an hour in the que I used my shoprite stamps that I had been collecting throughout the year. I told the cashier (Victoria) that it would be my first time to use stamps so I didn't really know how it works. She said she would count them out and help me. My total came to R1055.64. I told the cashier to take a R1000 from the stamps and i gave the remainder in cash. She marked some pages with a pen and then tore out the stamps. In total I had R2200 in my book. When returning home I checked my book and R1000 stamps was left, it should have been R1200. I immediately called and the lady I spoke to named (Carmen) told me I would have to call back the next day because they would have to cash-up the cashier to see if she is over with the R200. I then went to shoprite today (Monday 09 Dec 2019) to resolve the issue. I am very unsatisfied as I was not helped in the way I expected. The supervisor took my book and slip then went to see the manager (Mrs Emmanuel) she quickly came back to say the cashier was balancing and that due to loadshedding the footage was not clear. I don't believe that they were being honest or fair towards me. I think that only because it is a Mitchell's Plain branch that they did not put much effort into investigating the matter. I don't except the outcome!. I did try to contact there head office but have had no response from them. Kind regards Cindy