MTN guilty of *****

I have just received an sms notification that I am subscribed to MTN Play airG!

The message reads as follows: Reminder: Ur subscribed to MTN Play airG * R2/Day. For help call + ********** 7985. To unsubscribe click here http://m.airg.xa/out

I did not subscribe to this service! I dialed *141*5# which states I am not subscribed to any such service.

I want to know how this happened? and I want this refunded for the amount it deducted.