MTN Has A Terrible System That Doesn't Help It's Customers

My iPhone 14 Pro Max got ****** on the 24th of December and that same day I went to MTN, only to find out that their system did not have my iPhone on there so they couldn't blacklist it and I couldn't get an ITC number. I went to 2 MTNs and bith had the same issue mind you my phone had an MTN card in it with a registered number and everything.

I am now at risk of my insurance claim being rejected because of MTNs terrible system and they cant help me and yet I am their customer, furthermore their numbers do not work so I couldn't even get a decent call. I have emailed complaints but I am already discouraged.