Wrong billing for months

I have been struggling with telkom since August 2015 to cancel my old line as I have moved!After many phone calls to the *********** call centre and visits to various branches they have still not cancelled my line at my old house completely and now I have been handed over to a debt collector for a service I have not used!I was told I could get a ADSL line in my new home however I keep getting excuses that there is no space at the exchange!I am being billed for a service I cannot use and this is now affecting my credit!!I have logged many disputes on my account however nothing gets sorted out!why have I been handed over?This goes against the consumer protection act and I want it sorted out immediately as I have been struggling for months and nothing gets done as nobody knows what they are doing at telkom!