Vodacom's service is really bad

I have been trying to do something simple like an upgrade on two contracts on my name that's due for an upgrade. After calling them a few times to get progress on the upgrades I have requested, I had no luck. They said they will escalate this to their management and I have had no one calling me from Vodacom as of yet. But to be honest I have never had any good experience from Vodacom and have been with them for a few years now. I would love to go to another service provider but that means that I'll need to change my number. Could I please get some assistance from anyone with regards to this?