Vodacom do what they want and think they can "abuse"customers

Expired contract. No contract bridge on clients side. Client requested to cancel and go prepaid. Because client did not opt to take further Vodacom have now blocked client's account to make a company change. I believe that it is the clients choice with cell provider he wish to use. Client not in bridge of contract for contract already expired end Aug 2020. It is the clients human right to change the provider. Also taken in account the poor service and signals that Vodacom have been giving over the last few months. What give Vodacom the right. It must be also noted that the original contract was with other company. Client wished then to change to Vodacom and did so with no hassels. Now that he wish to leave Vodacom due to poor service they block him. How desperate can Vodacom get.