Correcting PAN number in Flat Registered Document

Dear Sir, One of my client name is Venkatesh Rajkumar. He got PAN CARD with incorrect details of father name and DOB. His Correct Name & DOB: Venkatesh Rajkumar & 10/03/1982 His Incorrect Name in PAN CARD & DOB: Venkatesh Rajesh & 14/07/1983 He has booked a flat in Chennai and for registration he has used this incorrect PAN since builder has asked only PAN Card proof enough for registration. Due to urgency of flat registration, without correcting details he has used this PAN Card and flat document also registered based on this PAN Card details. Last one and half year, he was trying to correct his PAN details thru. UTITSL with the support of all required documents (Annexure-A with Gazette officer Signature & Proof) but still he hasn’t got any proper response and corrected PAN card. After he fed up with this process, now he has applied new PAN Card with correct details. Also, one of the financial institution has offered loan for him with this incorrect PAN details. Now, Please advise on the below questions, 1. How can he correct his flat registration document with correct PAN Card details 2. Shall he surrender this incorrect PAN Card 3. Is it possible to move loan from incorrect PAN to new correct PAN Your guidance would be much appreciated. Looking forward your response. Regards, J