The most horrible service provider

I have never experienced this level of incompetence my whole life. I have subscribed for a service that costs R745 a month but clearly there is ***** going on here. August I got debited 2x subscription amount, September 3x subscription amount, October 2x subscription amount, November 4x subscription amount debited. So far they have only refunded two amounts and others haven't been refunded. Every single month, I have to run after you to give me back the money you have overcharged me which is not what I have signed up for. This is very frustrating and has been a nightmare trying to follow up on email with no response. How long will this go on, my connection isn’t even working on top of that meaning I have paying all this money for nothing. Do I need to open a ***** case before you can sort out your accounts issues?