Dear Majhar, NTA will not communicate anything through offline mode like letters to your mailing address. Every communication is strictly through online mode at your registered Contact number and Email. Even if you have entered wrong district details, it won't cause any issues for your counseling or admission. In case you receive any communication asking you to correct your mailing details you can correct them during the correction window. Without any mail from them also when the correction window opens on January 14th, you can make the changes.