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Use Share feedback on the homepage. That form is what I read.

Bugs, a wrong GST or tax figure, a broken PDF merge, a citation that aged, a tool you wish existed. Include the tool URL and what you saw.

For slab or rate disputes, add a link to the government source you are using (CBIC, Income Tax Department, RBI, UIDAI). I cannot fix a number I cannot check.

I am one person. I am not a CA or a law firm. Feedback gets a human look; it does not get professional advice.