Reversal of Payments

I wanted to reverse a payment of R400-00 after changing my mind about a purchase I made. When I called the service desk I was told that a form will be sent to me to complete as well as a R287 reversal fee will be charged.

WHY? How can you charge me R300 for a R400 reversal? Why are you charging me anything at all? You are there to assist me, not try and rob me? I thought moving from Standard Bank was better, but I clearly I was wrong. This is disgusting. There should be an option on online banking for a certain period to reverse your own payments. I am so shocked that this is now a norm. I am not allowed to make a mistake or change my mind, because the bank will charge me extra for assisting me of helping me to correct this error, doing what they are there to do in the first place?

I am so disappointed and I really can't believe how you as a bank can justify this cost.