Wrongly billed, empty promises of being refunded

I have been over-billed on my cellphone contract for a couple of months now, when I saw the problem after my last debit order went down I immediately phoned Cell C - this was on 30 May. The operator investigated and after consulting her supervisor they admitted that I have been overcharged and that I have been charged for a service I should in fact be receiving for free. I have been given a reference number and told I would be phoned back by accounts and that I will be reimbursed, or be notified by SMS when the issue is resolved. Well, more than 3 weeks have passed and I am STILL waiting. Absolutely ridiculous.<br> <br> Ref no. ***<br> <br> To add insult to injury, Cell C sales phoned me from 084 145 today twice and WASTED my time. \Sir you have been selected for a promotional phone package"BLAH BLAH this is unsolicited spam and I will escalate this matter if not solved satisfactorily."""