Charged for services not rendered

I called Vodacom since last year March about the network problem in my area and they said they did not have any budgets allocated for 2018/19 for my area thus I could go ahead and cancel my contracts. When I try to cancel my contracts they take me from pillar to post. I'm unable to use data bundles allocated to me and every month I'm not charged anything less than R650.00. When I call through my query is always under review and in progress.