No service, accounts complaint,Breach of contract

While abroad a friend cancelled roaming for me but MTN instead unfairly suspended my phone. MTN eventually claimed that my account was unpaid, but I am on debit order and payments all went through my bank account and on time. It took numerous visits to MTN shops, e-mails and calls ( list of 2 x A-4 pages with reference no, date and times) during June and July to have my service switched back on (successful after 6 weeks) and to sort out my account queries MTN only responded with electronic mail to tell me to contact the Customer service, but they hardly ever answered and when they did, I got a reference no from them but they never did anything about my complaints I was charged for all that time. I got a statement from a MTN shop early July as I haven't received statements since May, but was grossly overcharged (for calls never made, little data used as I am aware of the consequence) then deducted R4200.00 from my bank account What happened to my credits of calls, data and sms before I got suspended? Today the Manager in Vanderbijlpark took my letter to his office, after half an hour, I still had to leave without any luck of sorting my account out and refund