Billing complete shambles

A few months ago, I suddenly started getting additional large debits beyond the regular monthly debit. When I enquired as to the reason, I was told I had been in arrears. However, these exceptional debits continued. My account has always had sufficient funds for the debit. When I asked to see historical statements, I saw that debits which were shown as successful on my bank statement were shown as rejected on the MTN statement. MTN insisted each time that I got a letter from my bank to prove that the payment had gone through, which I provided twice but nothing was rectified. I am pretty sure the reason I was \in arrears"was because of these false rejections.<br> <br> Additionally"