What is mobiteacher

Firstly I played that horrible :"shake every day" game and I won a free song yesterday. Clicked on the link but didn't see anything. Received a message today that I subscribed to a 10 track pack @ R29.99 a month. ( I did not do that, nor did I attempt to do so.)

In my further attempts to locate an unsubscribe function. I saw to my horror that I was also subscribed to a mobiteacher service from august at a daily rate. In my haste to cancel that, I didn't take note of the cost. It could have been R10 a day or R30 a day. I remember seeing it as a daily rate.

Now I would like to know. WHAT IS THAT? And if that thing has been active since august what do you intend to do about it re my account? as well as the 10 track pack. Why would I intentionally subscribe to either of these things.