Poor service from Vodacom

I have been trying for the past 3 days to upgrade my contract as I received a message from Vodacom that my contract is due for upgrade, however none of the avenues one try seem to work, at the call centre I am left holding for ages and then the call is terminated as soon as I am put through to an agent. I also logged a request on-line to be called but this didn't happen either. I need someone willing and capable of assisting me to do an upgrade to contact me please.