Sick and tired of MTN

I have a stop order for MTN but my bank had issues on that day and I thought the stop order had not gone through so I made another payment of R580.00 as I like to pay my debt on time. It turns out the stop order had already gone through I called MTN and spoke to complete idiots over the phone who could not assist. I chatted to a person on messenger I who seemed to know what I was talking about I sent my last proof of transfer as per request and was advised 7 days for refund. I complained after 7 working days no credit he apologized but escalated again , I waited a further 4 days and advised refund was done Fri. 08/11/2019 but until now I have not received MY OWN money. I called the pathetic call Centre again as they did not reply to my messenger messages today and the agent advises it's still under investigation and I can only get back R222.00 but I was not in arrears or anything but I was already advised I will be getting back R580.00.