Cancellation of contract

As of 29 March 2016 i have been trying to contact the cancellation department on ***, without any success. From time to time i was on hold for 20min, on some of the calls. On 12 April 2016 i went to the Vodacom shop in President Hyper in Vanderbijlpark, i was helped by Polina(who tried her best to help me) but she also couldn't get through to the cancellation department. She then phoned the vodacom call centre, they then send a fax to the cancellation department, according to the lady at the call centre, the cancellation department would have phoned me within 24hours. As to date nobody from vodacom phoned me.