Unauthorised deductions from MTN cellphone account

On receiving my latest bill from MTN I discovered a charge of R604.68 (ex VAT) for "content services". When I called MTN I was told that this is for "Background for Whatsapp" and "Videos" for which I'm being charged R30 per day (R15 each). This has aaparently been going on for 30 days now so I will still owe more on my next bill. I said that I had never subscribed to those services and was then told that these subscriptions are often not requested by the customer but that there is nothing they can do about them as they are third party deductions ?????? They were able to give me all the details though of who the companies are who are doing the unauthorised deductions, in this case Media Filez and Uchater. I have to claim my money back from them and apparently WASPA is the organisation to report this to as well. Why are we not protected by MTN from this **** the way the banks try and protect us from credit card *****? Why can these people just start deducting amounts of money from our cellphone accounts? I now know how to cancel these services on my phone but do I now need to check everyday that they haven't been "reinstalled" and are running up my bill again?