How can I unlink one of my mtn sim

Please my MTN SIM can't receive calls or calls out it's saying SIM card error

My MTN Sim is block I need my MTN SIM PUK number My MTN SIM number is +233 551447537 Date of birth: October 23 1984

Pls I want to become an MTN Registration Agent; registering people and selling MTN SIM and recharge cards. My name is Miss Elizabeth John Okon, 44 years, from Ikono L.G.A of...