Now you can't do anything once you have submitted Form 15H.
There is a prosecution section for providing false information which can charge prosecution from 3 months to 2 years but it applies only when there is some tax evasion.
In your case you are paying proper tax and filing return properly so I dont think there would be an issue.
I would suggest you to apply for lower deduction u/s 197 rather than going for Form 15H.
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