Unathorised debit order for contract i never signed up for***

My contract for a router ended in March and to my suprise i am now being billed R58 every month for SmartOnerate Deal which i never signed up for. I received mulptiple calls from Telkom consultants wanting to sell me their produccts i never agreed any of the offers that was presented to me but they still proceeded with granting me a contract which i never signed up for. When ever i call the call center their lines are always busy.