Debited for data not received

I have had the worse service ever, I called and emailed numerous times regarding the Onair data plan that has been billed for over 3 months( OnAir Entertainment @ R179 - Hotspotter 10GB, Simfy, without receiving any data, I have not received any satisfactory feedback, the agents I spoke to promised to call me back but no one has called me back, I was told last month that the account has been cancelled to my surprise I got debited again after I receive an email from Joanna Pillay that it is cancelled. I want a full refund for the total billing. your service is the worse service I have ever received.