cant cancell my contract

My contract has expired in April , I have visited one of the Telkom mobile stores in Menlyn , whereby I cancelled my contract to change to prepaid so I can move my contract to another service provider. This was done early this month , ever since this I have being trying to call Telkom mobile which says that cant get a hold of me , and they need a alternative no, u cant get a hold of me because your service is poor. I have called your offices to cancel they cant transfer to the back office , is this a delaying tactic.<br> <br> Please cancel my contract these is no reason to speak to me or call me , the person at your store should have validated its was me