Vodacom poor service and ********** charges

I am really dissatisfied with the level of service received from Vodacom after being a client for more than 20 years now!! I have been heavily overcharged on my account for data and that Vodacom **********ly charged me for data and services. they refuse to unblock my account and after requesting a cancellation they refuse to do so as well. Data over R2200 for 1 gig!! at one point they charged me over 14k they are really *********** the poor. also a ********** contract taken out on my account which was not requested by me which i luckily caught in time.