No service from Vodacom

I have a data contract for 500mb per month. Without my knowledge they added 3gb per month and increased my monthly payment as such, which quite frankly is day time *******. I had a consultant to phone me today to discuss this. She told me I must phone 082195 to cancel this 3gb contract. I phoned this numbet just to hear a reply that this number does not exist. I want to now have my complete contract cancelled. Vodacom is not to be recommended at all. I also have a MTN sim and their service is just way above. The Vodacom data card no is ***.