i am subscrived to services of mtn play dont know, which i did not do. keeps chowing my airtime and they fail to unsubscribe me.

i am subscribed to services of mtn play dont know how, because i never did it. keeps chowing my airtime and they fail to unsubscribe me.I have called the call center thousands times but it dissapears for a day and comes back. I am so disgusted!