contract expired

My contract has expired and not only didnt Telko mobile inform me but you guys cannot cancel this contract via the phone. When i took out the contract i called the call center but now for cancellation you guys expect me to go out of my way for the poor experience i have had in the past 24 months. <br> <br> I did go to Sandton City Telkom office but you guys are closed so i have no other option to cancel and i do not want to pay you a single cent. Please cancel my contract immediately or i will put a stop order to pay you guys.