Refuse To Let Me Cancel Contract!

I got a Red Bull Mobile data contract several years ago when I needed it. I have no complaints about the service I received then.<br> <br> I eventually moved over to a 3G bundle from a competing supplier, and even lost my Red Bull mobile SIM card somewhere along the way because I stopped using it.<br> <br> I periodically send emails to ask to have this contract cancelled--to the Red Bull Mobile billing email, to Red Bull Mobile customer service email, and eventually even to Cell C customer service email addresses--all to no avail. Nobody at this company deigns to respond to my requests to have my contract reviewed and cancelled, but come month-end, there is the bill, always arriving promptly and taking my money via debit order.<br> <br> It's been 3 years since I last used a single byte of data on that contract, and probably a dozen or more attempts to get this company to respond to my requests to cancel it.<br> <br> WHAT DO I HAVE TO DO TO GET THESE PEOPLE TO LISTEN TO ME??<br> <br> Slightly less importantly: If they ever wake up and get back to me, will they refund me all the debit orders for all the months I didn't use any data AND HAD ALREADY ASKED TO CANCEL?<br> <br> You have been warned.