Vodacom poor clients services. They just don't care. Stay away!

I have cancelled my wifi with vodacom after 2 years because of poor signal quality. It is now 8 months later and they are still billing me for internet I am not using and could not use due to poor signal. I have contacted them more than 20 times. Nobody cares. Vodacom is the worst provider when it comes to client services in South Africa!