Twitter – Locked out of the Twitter account—need temporary password

It is indeed true that Twitter can't send SMS in countries with a long code. Looks like there's an oversight in this system so that it's allowing SMS verification to be used even though it should require confirmation via incoming SMS.

Twitter provides instructions at https://support.twitter.com/articles/20170409, but unfortunately those aren't of much use. I recommend you contact Twitter support via https://support.twitter.com/forms/sms and tell them about your case. They should be able to remove SMS verification for you. Please do read the first automatic reply carefully, as they sometimes require you to reply to it for the case to actually be opened for examination.

From the Help Center:

I'm having trouble confirming my email address

Nothing is working. Help!

If you’ve tried resending the email and you are still having trouble, here are some troubleshooting tips:

1. Are we sending it to the wrong email address? Double check your Account settings to make sure your email is entered accurately. See any typos? Do we have an old email on file? Make any necessary corrections and click save; we’ll send another email if you’ve updated the address.
2. Try changing the email address to an email address with a large domain (Gmail, Yahoo, etc.). We tend to have more success delivering emails to those types of domains.
3. Still need help? Contact us here.

Just for try you can just change your email and try to verify new email address.