Vodacom complaint

Vodacom overcharged us for an "auto" data function we never signed up for. 5 months later we received a back dated bill for over R20 000 worth of auto data. We have tried to resolve the issue with Vodacom, in person, online and via email (to the CEO) and phone calls. We have had our phones cut off for the entire lockdown period. We have been left with no form of communication and our business and personal lives have suffered. Vodacom will not cancel the over charged data and will not cancel contracts of allow us to move to a new subscriber. The main account holder is 67 and suffers from a heart condition and lives alone so its very worrying that he has no form of communication in case of emergency.