Billing Issue Reported in 2014 still not resolved

I've been billed by Cell C for a Service I have never received from them since 2014. I've actually phoned in multiple times and been promised calls back and someone will look into it. 2 weeks ago I thought I had finally made some Headway when Mr Aiyer promised to resolve it and account would take a few days to reverse the billing. To date no contact from them and when i got through to Tumi who is supposedly a supervisor I was told we would need to wait as she does not have any knowledge about the process though the feedback is logged in the ticket? I find this quite pathetic. I think as a Service Provider they are a liability to the South African Market with a sub-standard network that seems to be run by *********** children.