When your customers "subscribe" for ghost sevices

I never realized that my airtime disappeared because I always bought data bundles every first of the month. When Vodacom offered me a data bundle option I saw for the first time that my airtime disappeared almost immediate. When phoning them they said I did “Subscribed” for “whatsmob” ect. ect. and that that subscriptions took like R12 and R7 DAILY for almost a year!!!!! I never ever subscribed for ANYTHING. I can’t even find out for what I supposedly subscribed, so how did I and how do I stop it and how can I get my money back??? Where did the “so call services” get my cellphone details and how could I have subscribe for something I never heard of or saw?