Con artists

I was contacted in December 2014 by cell c in Durban stating I was due for an upgrade. Instead they added another new contract with a different number to my name. I have been struggling with this whole situation with my phone being repeatedly cut off even after cell c admitting their mistake. Now im being overcharged on my first contract, which ive had since 2003 by the way, and for the second contract which I never agreed to in the first place. NO ONE is ever able to help me. I have been promised many times it will be sorted out but nothing ever happens. I am now tired seeking help from other sources.