Vodacom service and upgrades.

Vodacom service is useless. I have been with Vodacom for more that 35 years. The service I believed was the best. Over the last few years the voice service has deteriorated to the extent the in the middle of the call people can't hear me. I know that it is not the phone because it works perfectly over IP based services. In Jan this year I tried to get an uncapped data service, I have now given up and cancelled the upgrade as they seem unable to get the service right.