Telkom's Bad client service

I went into Telkom store end of Aug to cancel old landline because we were moving and taking over new landline. Telkom firstly made the mistake to NOT cancel old line and since numerous calls/visits/tweets to Telkom I am still being charged for two lines and been promised that they will credit me from 1sept! Issue STILL not resolved and it is almost 4months down the line. Last month they even suspended my line because they say I owe THEM money?!? Apparently they have finally cancelled my old line but I keep getting a huge telkom bill saying I owe them money. Sick and tired of waiting for them to resolve my problem. I don't even know who to contact anymore, so frustrating! Very disappointed Telkom customer. Have always supported them but this time it has gone too far. PLEASE sort out issue ASAP! Awaiting my credit from 1Sept...