Not a client but deduction from my bank accoiunt

I am not a client of MTN and don't have any cell contracts with MTN. On 15/01/2015 an amount of R 42 590-04 was deducted from my bank account. I queried numerous times and after I had to send an affidavit, I was informed on 26/01 that the matter had been referred to the ***** department. On the 16th Feb 2016 the same incident happened but this time R44 051-44 was deducted. I was lucky to have the transactions reversed (which cost me extra bank charges) but after sending a letter again on the 16th Feb, I have to date not received an explanation for these deductions and how my information - most important - my bank account - was obtained to do these unauthorised transactions. This matter is very serious as someone could possibly have ****** my identity and I need an urgent explanation. <br> FJ (Johan) Booysen