Embarrassing moments at Pick n Pay when it was not my fault

U went to pick n pay Phillip Nel Pretoria West this afternoon and this is the 4th time complaining about their service. I made a purchase of R100 and asked a lady at the till to take R85 from my account and R15 will be cash. The card cancelled the transaction but took my money rom the account. The the second and third time it started declining saying insufficient funds. I then went to an ATM where it showed me that the money went through,but the manager still insisted that it didn't go through. I then had to bring my phone to the shop so that I can go to my internet banking to prove that the transaction went through. In those arguments and embarras*****t from the senior staff I had to wait for over an hour until one of the managers decided to pay the R85 then said I must pay him back as soon as the money is reversed into my account. I felt so liw as the manager was embarrassing me saying that how could I come to the shop knowing that I don't have money in my account. Something needs to be done about pickn pay Phillip Nel Pretoria West as this is not the first time