Demand notice

Dear Sir, Thanks! in advance. One of my client received a notice US 148 in march 2014 relating to escaping income ay 2007-08. Before submitting reply in march 2014 we asked to ITO to produce PAN no. and other details of my client they have? But ITO not able to given us Pan no and said (orally) about banking transaction(clue of escape income). We denied of having bank account their. And same name(of my client) found in his village and that person have account in that branch which was found by ITO. Then ITO(orally) said us no need to appear. Now, my client received demand under DTDRS Scheme 2016 of Rs. 6,16,845.(escaping income ay 2007-08) Please advise what we should do as soon as possible? regards vikas