Very bad service and total mess with upgrade

I have been battling for nearly 3 months now with Vodacom with regards to.my upgrade. After all the bad service, calls, forever holding on to speak to someone, no one phoning me back, I have also been blocked to.phone them, because they see I have made to.many calls to Vodacom. My upgrade was an absolute mess and now I am stuck with incorrect and no accessories and the incorrect contract term. Still no one has phoned me back or has this mess been sorted.