Breach of contract

Good day, I am experiencing poor customer service due to the fact that Telkom is billing us for services that are free, e.g. line transfer. They have currently suspended our account and we are meeting our monthly contractual obligations. Telkom is failing to resolve all mentioned matters and take months to respond to any queries. We are not receiving value for money and Telkom is in breach of our agreement as there is no consideration due to them suspending our account!