Error in etds retun

Dear all,

Due to typographical mistake in filing etds return, date of deduction of TDS was entered wrongly. Actually TDS was deducted at the right time and not later than the stipulated period but a demand was raised by the authorities of about 5000 Rs. Ample proof of correct time of dedcuation is also available. Can a remedial measure now been taken?? PLZ help.

I also want to know whether date of deduction, if entered wrongly, how can the authorities know about this.

Thanks in advance