Vodacom is trying to ruin my business

Our business is currently experiencing the worst possible service from Vodacom. 1. Absolutely no support or proper advise when we need it. 2. Vodacom Fibre has taken literally months for a new connection with little or no feedback. (Why? when Vodacom advertises for Fibre connections in the area). 3. We are unable to cancel any of our contracts at the store (Westwood Mall). 4. We somehow end up with new contracts after speaking to the sales consultants at Westwood Mall. 5. We are continually being billed for contracts that should have been cancelled months ago. We stopped using Vodacom sim cards but still get billed after notifying the store of our intention to cancel the contracts with Vodacom.