Mo'winz Telkom ****

I keep on receiving up to 5 per day of these play Mo'winz and win cash prizes and airtime etc. It gives you the option of *180*5*2# and dial to opt out....but when you do it says play as VIP and your status. I don't see any option to report it as spam or to block them . My messages is filled to the brim with this *******. I want this harassment to STOP IMMEDIATELY!!!