Vodacom

A few years ago we got a Vodacom Telephone number for our WIFI router ***) Since October last year we got a poor signal resulting in the WIFI not working. We complained 3 times, nothing happened, We got another service provider and established how to cancel the Vodacom number. We went 3 times through the procedure. However after each time , Vodacom still forwarded an invoice and took the invoiced amount from our account. We complained to the Vodacom customer care section twice and were referred back to the cancellation section. The second time we requested to speak to management, we were promised that we were going to be contacted, but after a week nothing has happened. Does Vodacom worry about customer service? P Van den Bon ***