Late fees for GSTR 4

A taxpayer who hasn't filed GSTR 4 since January 2017 is seeking clarification on late fee calculations. Despite receiving a notice exempting them from late fees, the portal is still showing charges. The user is confused about the discrepancy between the notice and the portal's calculation, especially regarding penalties of Rs. 5,000 or Rs. 10,000, which differ from the stated Rs. 50 per day for late filing or Rs. 20 per day for nil returns.