I need assistance

I got ****** on Sunday 8March 2025 and my iPhone 13 was taken. I've contacted both Rain and Apple to block the device. Rain told me they can't blacklist the phone and to contact the manufacturer (Apple), but Apple hasn't helped either. Neither asked for the IMEI number, but Apple gave me a case number.When I tried to log into my account, I didn't get a confirmation email about the device being locked. I'm worried about the security of my info.The only thing I need now is an ITC number so my insurance can process my claim. I'm really disappointed with both Rain and Apple