Very bad service

I am having severe bad service from Telkom. Since last year September I have tried to get Telkom to relocate my land line to my new adres and they still has done nothing, and to make things worst they keep billing me thousands of Rands per month even though I eventually canceled my account in May this year, the account is still active and I am still being billed even threatend to be taken to Debt Collectors. I have spoken every month since to Telkom about this matter since last year.