If you make a mistake, you should rectify it as soon as possible. Contact the bank or the relevant tax authority (CBDT/CBIC) for guidance on how to correct the error. In some cases, you may need to fill out a new challan.
Source: RPR Rule 8
What if I make a mistake while filling the challan?
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This answer is for informational purposes only and does not constitute legal advice. Always refer to the original rules and consult competent authorities for official interpretation.