Problem with refund

I am not a student at OLG but unfortunately I made an ATM payment on the 03/04 to their account from an FNB atm in error. On the 05/04 I called OLG and spoke to Bongani who asked me to forward him my banking details for a refund. On the 06/04 I called Bongani to conifrm that he got my email and all is in order and that I will be refunded. He promised that I will get my refund the followwing Friday, 15/04. When I called to confirm if that is still the case that I will be getting my refund on the 15/04, I spoke to Patricia who told me that there's no one else who is able to help me to confirm if I will get my refund on the 15/04 but Bongani, who was not availalbe to speak to. Before that I spoke to Tsakane who on the other hand told me that such payments take up to 15 working days to get processed and paid. I asked Patricia what if the payment is not done by 15/04 midday what should I do and she said I should call them back. My question to her was if the money is not refunded, I call them what will then happen, she did not have answer, she couldn't confirm how long it takes for payments to be made. There's no consistency and accountability from anyone I spoke to. Bad service.