Mtn Gamer +

Ive been receiving messages from MTN Gamer+ saying that i have subscribed to it and that it is costing me R3. 03 per day. I did not subscribe and i tried unsubscribing. I need MTN to deactivate this as soon as possible. Here is the message that ive been receiving : Reminder:Y'ello. Your Subscription Service to MTN Gamer+ at R 3.03/day was successfully renewed. This notification occurs weekly. To cancel dial *155#. Visit now http://gamerplus.mtn.co.za/.