Win Samsung S5

I also entered this competition where you win a Samsung S5 bytexting your answer to 34471. I have been doing this and currently have over 1000 points then I ended up subscribing to Discovery Zone and now I am really confused because my airtime is reduced by R2 daily and nothing is said about the actual competition. I called the call centre to confirm whether this is a legit competition and the consultant confirmed this. I am now trying to unsubscribe from this Discovery Zone but there seems to be no way. I need to unsubscribe with immediate effect and therefore need your assistance.