MTN is not what it useto be!!!!!!!!!!!!!!!

Supporting MTN for 10 years, for them to suddenly decrease my credit limit which i was then unable to upgrade. Well thats is no biggy.....However, I then cancel 4 of my 6 contracts yet still billed after it supposed to be cancelled, leaving me disconnected and with a stinking credit record. 1000 calls, 1000 emails and still nobody can resolve this mess!!!!!!!!!! FRUSTRATING