Incorrect billing and debt of my account

I have been a customer of Vodacom for years, but have been extremely disappointed with there service lately. They sent me a router last year which was then returned to then within 3 days, the router and monthly data costs continue to be debited from my account. Vodacom shop as well as the call centre keep blaming different divisions of Vodacom and no one is willing to investigate the matter and reimburse me. Secondly, the fees on my actually contract is incorrect and again no one can help me. I have called every number and gone into numerous Vodacom shops to date. Furthermore, my contract has expired 2 years ago bit because of all the additional contracts and numbers opened in my name I cannot upgrade my phone. Horrible service and no resolution for over a year!!!!