Disappearing airtime

I am on a top up contract with MTN and had issues last year of disappearing airtime like over R30 per day . I contacted the 808 callcentre and was told i was subscribed to some content service which i dont even know about .And then they deleted them .This month from the 6th September my airtment kept dissapearing i was told them same story they have deleted them and i can use *141*5# to delete a day late im subscribed again ,the 10thh once more same companies .Today i call again i want this content subscribtion blocked completely off my phone .The agent told me some i couldnt see them with them only they can .So MTN is giving these companies access to our cell numbers and allowing them to take over R40 a day becaus i have restricted my data on my settings . i dont click on links and im just automatically subscribed how is that possible .The lady who helped me was Yolelwa i asked to speak to the superisors they all refused to speak to me and the names i was given of the supervisors in charge were Hlekethwa ,Thandi and Zanele ,I could hear them in the background saying no i must wait they will call back.So much attittude from MTN .I want to be called as promised and i want a permanent solution all these things permanently blocked the same way the allow these companies to chow our airtime they can block them .I wont phone everyday after lossing R47. i have contract with MTN not third parties so i should be protected as a client from such things