Tds not deducted

Dear Sir/Madam, 

One of my client not deducted TDS for frieght for which he is liable to deduct and pay. The Transporter is having more than 10 Vehicles in Last Year. But in Tax Audit we have to disallow, and the entire disallowable expenditure coming around 15Lacs, Client dont wants to pay that excess amount of tax, can we revise the tds return or is there any otherway to claim that expenditure as deduction. Client is Partnership Firm.

Thank in Advance