******* MTN Subscriptions

Almost every second month I have to phone in to MTN to cancel subscriptions that I never subscribed to. When I ask MTN how the subscriptions came about then they tell me that it's popup's from Google that I mistakenly clicked on. The thing is that I don't use my phone to go onto Google and the other issue is that all these subscriptions are linked to MTN, eg MTN Gamer+ Daily R4 per day. MTN is here to rip us off and they never refund you when you tell them that you did not subscribe. If possible I would really like to get out of my MTN contract.