CONTRACT NOT CANCELLED

My contract expired in December '15 but i'm still being billed and i signed a cancellation form an agent called but couldnt get hold of me due to an urgent matter i had to attend to. Based on that the agent closed the query without cancelllation of the contract, why would i sign a cancellation form and still want it not to be cancelled , does that make sense???? Janaury''16 i was debited amd this month as well, i will not pay a cent until this matter is resloved. All i have been getting are refrence numbers not helping me at all... i dont data or any contract with telkom.