Show cause notice for JAXJ2 MISMATCH

ca (accountant)     23 December 2020

WE GOT ATTACHED NOTICE.

MY CA SAYS IT'S REGARDING OLD REFUND, BUT ST DEPT. WANT US TO SUBMIT COPIES OF LAST 6 YRS PRIOR TO NOTICE PERIOD, ALL C-FORMS WE'D FILED WITH CORRESPONDING SALES INVOICES & IT'S LR. EVEN THOUGH NOTICE IS FOR JUST 3 MONTHS PERIOD PRIOR TO GST IMPLEMENTATION.

We would like to know understand below points.

1. Notice is for what exactly.

2. Details of mismatch also not given in notice.

3. Dept. has asked for 3months details, then why we've to submit all details of past 6yrs. 

4. Dues shown almost 25 mismatch amt. +25 penalty +25 interest =75K. Couldn't understand, so much, how ? & of what ? Without any details.

REQUESTING TO ALL EXPERTS PLEASE REPLY URGENTLY WHAT WE SHOULD DO ? 

DO WE HAVE TO SUBMIT ALL DETAILS OF PAST 6YRS PRIOR TO NOTICE PERIOD ? AS PER OUR CA.