SIM Suspended due to ALLEGED outstanding account

My SIM card has recently been suspended. There is no number to phone which can actually help you with an issue such as this. I sent an email and was, after 3 e-mails from MTN, provided with the response that my account is in arrears in the amount of about R1 400.00. I wish to state that my account is not in arrears and I have paid in terms of the latest statement and invoice received.

I have requested that this matter be solved urgently as I am left destitute without the ability to make a phone call. I have requested to be phoned (as there is no number to phone them) but still, after 3 hours, no one has phoned me.