As per the NSDL website which handles tax payments on behalf of Income tax department, in such case , a taxpayers hould contact his assessing officer for rectification of mistakes. Here is the excerpts of FAQ Your Bank provides facility for re-generation of electronic challan counterfoil kindly check the Bank website, if not then you [...]

Archived; click post to view. Excerpt: Income tax Act provides ways to rectify any error which comes to light . This right is provided to both-assessee and the A.O . There is also time limits for  such rectification . I T Act provides that an assessee can move an application for rectification of an order within 4 years from [...]