Got Show Cause Notice for a Imported Adult Toy 5 years ago from custom department

Hello Team, Received an Show cause notice of imported Adult toy 5 years ago now from some foreign e-commerce website. Asking me, to come in person within 15 days to custom department mentioned address to prove why items won't be confiscated and why I shouldn't be penalized. Basically, I was not aware about any such custom act so ordered such article for a personnel use and as its not delivered to me within 45 days of time, I had asked seller to cancel the order and got the refund 5 years back only. Now after 5 years, custom department is saying they have confiscated a product in a SCN. DIN number seems valid from Custom department website as Earlier I was thinking of some kind of bigger scam by getting such speedpost letter. I have been relocated out side india 5 months back and so I got to know about such letter very late after the due date to appear in custom department office is gone. What should I have to do now? Should I Engage a Lawyer who can represent me on my behalf and appear for a hearing & get the penalty settled? Or Simply emailing them would work in provided email-id? Or Can I keep calm and wait for them to send penalty amount as I anyways mistakenly order this without any knowledge of such Custom department laws?