unhappy vodacom customer

Good day I am getting frustrated with subscriptions I know nothing about. Twice now that when I recharge my airtime getting taken by these subscriptions I didn't even subscribe to. And vodacom can't even reverse the airtime and credit me back. I am honestly not happen with this because I don't even know of them or why I'd subscribe to them. This needs to be sorted out and cos I can't keep calling vodacom regarding this issue. Vodacom needs to come up with a way of blocking them.