********** simcard made on my behalf without my knowledge

I will never ever continue with contracts at vodacom, will definitely cancel all the contracts I had with them when they are due for upgrade. I reported a ********** simcard contract made on my behalf when I was upgrading on my *** number, they promised to come back to me after I have reported the matter several times to them but with no luck. Instead they've been giving me different Ref numbers to me, I've been with them for a long time but now my intensions are to get rid of them, because seemingly they don't care about their customers.