Astronimical data calls-'Capped' SME cell account

My MTNChoice100 account - *** - Request *** - I noticed as astronomical increase in my MTN debit order and tried to investigate. MTN had stopped sending me invoices and statements, my self-service was not functional because MTN changed their portal and numerous attempts to get either statements or invoices proved fruitless due to the strike and inefficiency. Every call I logged was immediately closed without contact (I have records of as many as 20 logged calls closed in such a way). In the meantime my account grew fro R2,500 to R20,000 for 3 months running. This phone has never used data and the user uses wi-fi only plus the fact that I have written confirmation of a 'soft cap' I am entitled to AN IMMEDIATE refund. My next step will be the Ombudsman, the consumer press and then legal ...... the sum in question is R19,941.15 as at 26 June 2015. I cannot see if this continues into July as I still don't receive an account, either by mail or e-mail, and my self service still doesn't work. I've been a loyal MTN customer for 15 years and I'm disgusted with the situation!!!!