I want my money back!

If I could give this 0 stars I would. I accidentally paid my account twice this month, I know - silly me. I have called in so many times over the last 2 weeks, spoken to a different call centre agent each time, emailed them the required proof and information each time, all to try and get my money back, but to no avail. No one seems to be able to help. Every time I call, and each call goes on for 30min +, they log a new service request. By the time the call is over they email me to say the service request has been closed. I don't understand why it's been closed if nothing has come of it. It has been impossible to try and get the correct assistance for me to get get my money back. It is honestly like pulling teeth. Of all the cell phone networks in SA, MTN is by far the worst - especially their customer service/assistance. Hopefully this gets seen by someone and I get my money back.