Default In TDS Return - Utilised Challan

There was one challan against which tds was paid and was accordingly shown in June quarterly TdS return.
Now while filing TDS return for the quarter ended September, the same challan was reported by mistake with different date of deduction and payment.But it was the same challan against which tds was deposited.The challan was already utilised.Now there is a notice of short payment with interest.What to do in this case?