******* debiting

I have been disputing an account with I smart for more than 5 years initially I had a contract with them that had come to the end of its term I have now had 2 contracts with mtn using the same phone number initially they were claiming an amount of more than R7000. 00 when requested how this was made up we were told additional data charges on a top up contract when requested proof it was never provided the contract that was taken out in 2012 and every 6 months they decide to run a debit order on my account without consent or authorization my bank states nothing can be done besides reversing the payment, I think this is ridiculous no proof of outstanding funds as well as being in dispute for 5 years no itc listing in the negative I am sure that this is ******* practice, many requests have been done to provide something however nothing, now no calls emails or sms but a debit, note my contact number has not changed in 7 years.