@PiyushGupta Hello, HNI applications once made can not be cancelled, though can be modified upwards only. It is best to leave it as it is now, you never know when fortune favours you.
Putting another application/s from same PAN credentials will lead to multiple applications and all such applications are liable to be rejected.
In future, be careful. Also, why should there be any hurry to put application on first day. Check all parameters, subscription levels and apply on final day/ even if you apply early (using UPI mode), mandate may be approved only on final day.
Good Luck 🤞