Cell C(Not happy)

So Cell C has this "Get More" service. Which deducts a certain amount monthly. I never agreed to it, but saw a deduction on my account. I called them on 1 December. Complaining about it. They told me they were going to stop it. 5 months later, i check my statement and realise they were STILL deducting that amount. Which now resulted in an amount more than my monthly contract. I contacted them again in May to resolve it and get a refund as i already contacted them in December and was told it would be stopped. But it never happened. I contacted them a few times already. With NO success. Every single time its just "We have to escalate it to the accounts department for investigation" EVERY SINGLE TIME!! The one time i had hope, because the consultant told me she saw there was a refund due on my account, she even asked me if i wanted it transferred into my bank account or if i want it credited onto my contract. I told her i wanted it transfered to my account. And she asked me to send her my banking details/ bank statement. To which i did.... Nothing came from it. I called again, and guess what!! "WE NEED TO ESCALATE IT TO THE ACCOUNTS DEPARTMENT FOR INVESTIGATION" i asked them "What is there to investigate???" And they said they need to check the call recordings to see if i called for cancellation. I asked them to check the call i made the 1st of December. They told me "Yes we see the call, it says you were did not agree to the service and you don't want it" and i asked them "Well what does that tell you???!!"and they said "Nooo but the conclusion was not to cancel" and i was like What the hell!!??? Since December its been 9 months now, they cancelled the service in May only, when i requested for it to he cancelled in December. And they wouldn't assist in the refund. I feel it is very unprofessional. And they're just doing this on purpose to avoid paying money. Which is against the law!! I've never skipped a payment with my contract. Yet i have to struggle to get my money back???