MTN IS RUINING MY LIFE AAHHHHHH

My phone broke about two months ago, every now and then I would insert my Sim card into another device so that I do not lose my number as all my accounts are linked to this number 071….4553 . 3 weeks ago I made a call as that number has airtime, Over the weekend I discovered that MTN has disconnected this number from its Network. I am unable to access any of my verification notifications as this number is linked to EVERYTHING. I can’t change anything because it needs that verification to change anything AND THIS IS THE SECOND TIME THIS HAPPENS