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Have you tried syncing your iPhone in iTunes?
Do you have access to WiFi? Does WiFi calling work?
You can call T-Mobile's international support line at +1-505-998-3793 from your T-Mobile phone at no cost.
AFAIK, T-Mobile's online message system is broken. Believe it or not, they want you to contact them via Facebook or Twitter.
Here are the instructions for unlocking an IOS 12 device: Mobile Device Unlock: Apple iPhone on iOS 12
I know it has been a few days since you originally posted -- have you been able to unlock your iPhone yet? If not, did the info that drnewcomb2 post help? The only other recommendation I have is to get in touch with T-Force over Facebook or Twitter to see what the hold-up is. That option may work best seeing as how you're outside of the U.S. and calling may not be super easy.
Good morning, magenta7247315!
Just swinging by one last time to see if you still need help with this. If you do, please take a look at the info that has been posted first and let us know how it went working with T-Force.