Hi Wole, you can login to MTN backup online portal to check if the numbers are still there you can contact their customer care for them to check for you.
You can use this link...
I am deeply sorry for your missing line.
Kindly contact your bank to prevent an authorized access to your bank account if the line is linked to your bank accounts.
Sim swap by...
I am currently in Manchester United Kingdom. I lost my phone this afternoon. i need my SIM card to be blocked because my bank accounts are linked to this Phone number. I am at...