There are these messages that keeps popping on the screen of the phone for subscription even if u cancel they still go through and chaos ur airtime

There are these messages that keeps popping on the screen of the phone for subscription even if u cancel they still go through and chaos ur airtime. Yesterday I bought airtime and my money was gone and Vodacom would not take ownership to this saying its some other companies whom I don't know and and have no business with them. Even if you go manually to block these guys they still come through. Called Vodacom today to complain and still awaiting a call from one of their managers to call me and still waiting. Very disappointed with Vodacom and their bad service.