Vocacom: they never stop disappointing

Yet again, there appears to be no other way of addressing Vodacom's unprofessional, disrespectful and ineffective service than this one. My previous two complaints regarding a totally dysfunctional phone which I have had to send back numerous times are flatly ignored. I have merely been sent the same *******, with a few parts replaced - so it continues to be as dysfunctional. I have pleaded with Vodacom NEVER to send me the same phone again - to no avail. It is like speaking to a wall. I am told that if I want to upgrade sooner, in order to be able to secure a WORKING phone (because it is CLEAR that Vodacom has absolutely no interest in helping its customers), I will have to settle for an upgrade over the standard 2-year period, plus whatever time I have left on current contract. Vodacom is not keeping their end of the contract - and now they want to ***** me further. I have had enough. I spend a LOT of money with Vodacom and was sold a dud (by the admission of the branch I work through!). I ask that you consider upgrading me immediately, with a standard 2-year contract. I cannot run a business like this. I need this addressed urgently, as I will be travelling soon.