Proof of payment but cut phone

Same cell number and account number for 15 years. June 2015 payments not credited to account. July and August Credited - so nothing wrong with account. Spent 5 visits to MTN Store Centurion over past two months with Bank produced proof of payment but incompetence prevents fixing my account. But MTN is competent enough to cut my phone and threaten me with legal action when OUR ACCOUNTS are FULLY PAID UP. MTN is in breach of Contract. I have paid for services not being delivered.<br> It is clear that MTN does not care one hoot about its customers.<br> Cant wait to end my contract and change service provider.<br> Telling everyone I know to avoid MTN.