MTN Gamer+ without my consent

I think MTN has signed me up for something I did not agree to. Please assist immediately. Its taking my money.

I received 2 SMSs Message 1: Y'ello. You have been successfully registered with MTN Gamer+. Your account username is ******* and your password is *********** Message 2: Y'ello. Thank you for subscribing to MTN Gamer+ at R3.03/day or a lesser amount. 1st day is Free. Visit now http://bit.ly/2FH8v0j. To cancel dial *155#. Call 135 for help. Ts&Cs www.mtn.co.za.

Please assist, I tried the cancel link and it doesn't work. I did not sign up for this. This feels like a ****.