MTN bad customer service

Good Day I have an urgent account complaint. my debit order has been taken from 1/3/2018 R1000 more than my subscription, it has now been 4 months done the line after emails and seeing MTN personally to cancel the content charges on my account. My account no: C ********** . I have been with MTN for approx 12 years. I have not changed my service provider and this is not the first time that I have asked to cancel something and it has not been done. I have an email from Charity Nyakale stating that my charges have been cancelled, I have also an email from Darren Govender asking why my charges have not been cancelled? What do I have to do to get my refund back and to cancel these charges? I have tried to stop the content charges and it does not allow me to when I send the message "stop", nothing. The content charges are on my ****le whereby I don't even open messages??? the worst part is the content charge is MTN Gamer, your own company and you charge me and cant cancel it???? MTN is the worst and I want my refund of at least R1000 over 4 months, a total of R4000 been *******ly taken from my bank account. I cannot afford a debit order of this magnitude. I will be going to the ICASA to sort this matter out if I do not get a response from MTN AS SOON AS POSSIBLE!