Contract Cancellation

Tried to cancel data contracts since October. Everytime I called they where more interested in upgrading than cancel, promised that I would receive a cancellation sms within 30 days only to be billed at the end of the month. The consultant then puts the phone down without giving a reference number, or when they do give one they have a horrible attitude. Everytime I phone a Vodacom outlet to check whether its been cancelled, they say that there’s no mention of a cancellation made on the line. Terrible Service, really shocking!