Terrible service Vodacom!!!!!

Complaining about the **** service from Vodacom as usual. They are over charging me for a contract I canceled and been calling about this contract for 3 months now and each time they said I should cancel end of November and then I did that And now they said I should've give 30 days notice so still need to pay another month which I will not because I called end of last month and beginning of last month. It is on record so the woman who assisted me should've put in a 30 days notice which she didn't. Talked to vodacom about this and they were suppose to get back to me today which they didn't and I got a bill with the old contract still on!!!!