Call and show cause notice

I had ordered a RTL-SDR dongle and antenna set from rtl.com and after some days I received a call and show cause notice from the customs and saying that the consignment was mi-declared as a gift having FOB/CIF value as US Dollar 0. The consignment was found to contain DONGLE and Antenna which falls under restricted goods category as Radio Equipment( WPC/ETA required) . The goods appear to be undervalued and the value declared appears liable for rejection and goods to be assessed at fair value as per section 14 of Customs Act 1962. The said goods appear to be liable of confiscation under section 111(m) and or section 111(d) of the Customs Act 1962 and the importer appears to be liable for imposition of penalty under Section 112(a) of the Customs Act,1962. Now, I just ordered a product online for my study purpose I don't understand what to do because I didn't misdeclare the value and moreover WPC/ETA certificates are required for transmitters and the dongle I ordered is a receiver instead. Please help me solve this situation.