Disappointed in the bad customer service and unauthorized Debit order

I am very disappointed in the debit order that went off on bank account that I did not of at the amount of R876.28. I do not know anything about the debit order as I need to use that funds for personal use and to pay some bills. However I am not able to dispute the amount and therefore contacting via email. If possible may I please have the funds refunded as soon as possible I need to use it for some personal use and bills. You guys sent me to different companies and that companies sent me back to you and you saying the funds do not reflect on your end I'm so disappointed in MTN they can't even resolve a simple issue and I've been a customer with MTN for years already but yet I've received bad service and still waiting for the funds to be refunded after I was told I don't owe MTN anything