OVER CHARGED AND NO RESPONSE

Roughly a year ago I phoned MTN and asked them to assist me with setting limits on my data accounts so that they don't go over the limit. The telephone consultant talked me through the process over the phone. I am on a capped contract and in March and April we have been charged a massive bill for data. I called, emailed, called again and all I have received are the auto email responses. To my knowledge they have not even checked my account or tried to contact me to explain why my account has gone so far over the limit when they helped me set a limit on it. I then contacted them to tell them to stop my debit order and to date no-one has been in touch to assist me with this. I am utterly disgusted that no-one has attempted to get into contact with me at all to try and resolve this issue. I can bet my bottom dollar that they will not hesitate at all to debit my account with this astronomical amount, which they promised to investigate.