Refuse to cancel my account.

I'm trying to move to another service provider because of the Telkom's standard useless service. I phoned them and they said that i must fill out the forms and mail them to Telkom. I filled out the forms and sent them through as per Telkom's request and the process that they said that I must follow. They are supposed to cancel after a month which it has been now and still nothing. 2 weeks ago I phoned them and they they said that it will take 48 hours to move my line into the holding pool so that I can move over to the new service provider. Obviously and true to form 2 weeks later still not moved to the holding pool. Call's to the call centre are and absolute waist of time and you get the same standard answers. Surely they are in breach of contract.