Poor Service Received and lack of feedback

I lodged a complaint with Cell C for the first time on the 30th of December (REF ***) last year due to a billing error on my account. It's been six months and this query is still outstanding. I have been sent from pillar to post, and have received many phone calls but none of them have been able to finalise my complaint and result in the refund of funds due to me!<br> My last interaction with Cell C was on 10 March 2015, REF ***. I was promised that somebody would call me to finalise but to date none of this has happened!<br> <br> This has been one of the worst customer service experience I have ever had. This is something simple that should have been dealt with a long time ago!!