HOW TO STOP UNNESSARY MESSAGE FROM MTN

I Know Many Of you Are Tired of MTN Useless Mesage.
»If MTN keeps disturbing you with unending and boring text messages and you want to stop it
==> just send stop in a text format to 33111
then u get a txt telling u, u'll be removed frm dere database in the next 24hrs.......
U'RE GUD TO GO