Improve Customer Service

I went to make a cash deposit into a friends account. I waited in line till I reached teller,who declined to serve me citing lack of a numbered slip which I was not aware I needed nor had I been offered one.I had to rejoin line from the back. The following day I was chastised for not having the exact amount to deposit as the teller stated it is not their responsibility to issue change.Please note Im not a Capitec client.I dont forsee myself becoming one in the near future.