Paid 3 times for 1 cellphone cover

I purchased a cellphone cover for R 199 on 13 November 2015 at the MTN branch in Rustenburg across from Game. The transaction only reflected on my bank statement on 21 Nov 2015. Then on 24 Nov 2015 it showed on my statement it went off again and then again on 26 Nov 2015. I phoned my bank first and asked about it, they said it is transactions and not faults from the banks side. I took a print out of my bank statement to MTN and highlighted the transactions as well. On Friday 27 November 2015 at 13:00 i got a call informing me that they will refund one of the R 199 but the other i must talk to the bank and they gave me a reference number. I phoned the bank and they said they do not understand because it did went of my account and MTN must refund these transactions. I called MTN again and they said that is the way it is end of story. I want my money back, i do not know in which business is it possible to do this. I was also \fined"from my bank because my account was in the \""red\"" because of these transactions that went of 2 times extra. Please refund my money. this is theft."""