Vodacom Upgrade

I Am very disappointed with the service received from Vodacom customer care *** for upgrades. My upgrade is only due on 04 June 2015, I am using my phone for work and travel a lot, my phone is giving me huge problems making it unsafe for me to travel alone as it does not work all the time. I phoned customer care to hear if I can not upgrade 2 months (60 days) earlier even if I have to pay some kind of penalty. The ladies (if you can call them that) at the customer care that I spoke to where unhelpful and very rude. The \team leader"(what a joke) told me that she can not authorise something like that"