Vodacom terms and conditions change regarding upgr

Ok so my phone broke, so I offer to pay the last few months of my contract so that I can simply just upgrade, get a new phone and go on with my life. So now the person at the vodashop tells me that Vodacom has changed the policies regarding this (Cell C's fault??) and I simply can't do it, so now I am stuck with my old useless phone, thanx vodacom :(