Bad service

I went to buy a UNI-PIN ELECTRICITY for R200 today at 20:03pm and showed the cashier how does it looks like with my phone then only to find out that the very same cashier (Kombi Wisani Maluleke) entered the meter number of the card which I don't use every time when I buy the UNI-PIN ELECTRICTY she gave me the wrong voucher for R200. So I returned to the shop to request for the correct voucher pin only to find a very bad return service from her telling me that I said she must enter the meter number. Only to find out that not even a single manager was on duty when I returned to the shop at 20:15pm. The Manger (THABNG SEEPA), was called on his cellphone number to talk to him over the phone and as I explained to him the situation he had the nerve to state that I gave the cashier on duty the incorrect number for a UNI-PIN. Trusting that pick n pay is the best in terms of customer service and putting their client's needs and requests first seems like I had the wrong impression to that point where the stuff doesn't even take pride that they are representing the big company that puts customers first and in that regard of a bad service I received right now I don't even have electricity at my place because of a cashier's negligence so sitting in the dark makes me realise that pick n pay is just selling a dream only to the customers because what they preach they don't do.