MTN customer abuse

MTN sucks, for a few months I have bought air time from MTN . I once had R60 Air time and that particular month I never made or recieved any calls but 3 weeks later I get an SMS saying that my air time is depleted. I tried calling MTN customer service but no luck, I then went onto their Facebook site and complained, again nothing. Over the past month I've complained on their Facebook platform, still no luck. I received a sms from a company called Brightside saying that I subscribed to them at R2.00 per day... which I never did. So I try getting hold of MTN again so that they can explain to me how this company got my personal details and what i need to do to get this cancelled...no luck. For about 4 months I've been paying for something i never asked for and MTN debit my air time. How can a company get away with this sort of business and then just ignore their customers.