Casual Taxable Person under GST

Hello Friends,

I have applied for GST Registration as Casual Taxable Person and paid a sum of Rs.3000/- as Estimated Tax Liability while applying for registration. Unfortunately, my application got rejected. Aadhaar authenticated during registration.

I am not able to apply refund for the amount paid Rs.3000/- by logging via TRN. While applying for refund under others category, it asks for aadhaar authentication, but gets struck in that page only.

Anyone provide me solution for this issue.

Thanks in advance...