'Unable To Do Welcome Bac For My Stolen MTN Sim'

hi guys my phone was stolen three days ago alongside my business Sim card, but since then I've been unable to do a welcome back for my sim, I was told its unavailable for now pls guys any knowledge on how to go about it cuz am losing a lot of business because of my lost sim

source http://www.nairaland.com/6351721/unable-welcome-back-stolen-mtn