Cell phone contract upgrade nightmare

My cell phone contract expired and i proceeded and filled in a form to cancel in June 2015, only to get a call from a Anita Dlamini on the 16th July who told me she is from Telkom(****) she was actually calling from Celldirect. she convinced me to upgrade and i will receive my product via a courier company. i have phoned Telkom to enquire about the order and even went to the Eastgate branch. no one can help me all they are telling me is that i have a contract with them which will expire in 2017 two years from now. they further said i will be billed for this, even though i havent received anything from them nor did i sign any document about receiving a phone. Now im sitting here with a bill on my way and no service from TELKOM and they are telling me there is nothing they can do. i must phone Anita, which i did countless times and even sent an email to her and her Manager Renzo Zanetti. im yet to get a response from them. Im being sent from pillar to postPLEASE HELP!!!