Finally, they sent me the 147C letter. I tried various methods, and ultimately found success with Fax.Plus, where I obtained an American fax number. I called 1 (800) 829-4933 and had to request the letter three times. Initially, they were reluctant to send it to me. On the second and third attempts, despite waiting for 20-25 minutes each time, I did not receive the letter. They advised me to wait up to 24 hours for its arrival. Surprisingly, I received the letter after 3 hours.