Worst Service ever FNB!!!!!!!!

I transferred money into the wrong account. I called FnB to ask if they can assist me by reversing this transaction. The consultant was very rude and unhelpful. I was then told that I will have to pay an additional R300 to get assistance from FnB. My transaction made was only R500 and now I must pay R300 to get this transaction reversed. This does not make sense. Absolutely shocking service from this bank. When I told the FnB assistance I would consider closing my account, instead of keeping e as a client she was more than willing to close my account. This is the worst experience I ever had with a bank. Absolutely useless. I would never recommend this bank to anyone going forward. I rather lose my R500 than to pay FnB R300 to reverse this transaction