FRUSTRATED CUSTOMER!!!!!!!!

I accidentally sent money to the wrong account and I immediately contacted FNB. They sent me a form to fill and I did what they asked me to. Didn't even take that long and they responded informing me that it would take ten working days for the outcome. They responded two days later and it was definitely not good news, how can a bank tell me to deal with their client when I don't even know the person? I contacted the bank personally and their customer services doesn't provide the best service. One of your consultants hung up on me claiming she cant hear me. I have been calling since the incident happened and it doesn't seem like anyone wants to help me. What is the point of having a banking app when I cant even do any jack on it. I accept my fault by not double checking before sending but since they couldn't retrieve the money, can't they set up a debit order to that account. What's making me mad is the fact that the money was spent on the same day it was sent and the reference clearly indicated that it was from a unknown person. FNB services really suck big time. Do I have to be a private client before I am taken seriously?