Worst service and attitude from Standard Bank employees

I took out a loan with Standard Bank last year in June. Last week, I went to the branch at Centurion Mall at Reds to find out my balance and after they told me, I disputed it because I thought my loan was taken out in 2015. They told me to go look at my contract and I told them that I had misplaced my contract, so the lady called their customer care and was told to request statements from the date that I think I might have taken out the loan. I asked about the fee and the lady in the branch said she'll waive the fee. When I got home, I looked for the contract and found it, and realized that I did really take out the loan in 2016. Today, I received a call from Mall at Reds branch and they told me they received the statements, so I told the lady that I looked for the contract and found it, and that the date was indeed 2016, I told her it was my mistake. After ending the call, I receive another call from a lady by the name of Giveness, a consultant at the same branch. She then told me that because I found the contract and realized it was my mistake, I am liable of the statement fee of R300. I asked her how this is my fault because as a person, I do forget and I needed clarity, she then told me how I had given the bank a bad name and I asked her how then she said to me "because on our notes we wrote there that you say you took out the loan in 2015 but we're telling you it was 2016". I told her I don't see how this is giving the bank a bad name and asked her if this is now my punishment and she said "you didn't come back to the branch to tell us you found the contract". Upset, I told her that I'm going to complain on Hello Peter about this and she said "it's fine, you can go complain but we will be debiting your account with the R300." I can't believe such terrible service and such a bad attitude!!!! Please do something regarding this and I will be expecting a response on this matter. I am so disgusted with the way people give service to clients and expect to get a salary at the end of the month, for what? Standard Bank doesn't need people like Giveness working for them because they are ruining the brand. Appalling!!!