PAN Card Surrender.

Party is having two pan card because old pan was misplaced and not single copy was available with him. He was unaware and applied new pan. Now he has found his old pan and want to surrender one. Old pan is not linked with Aadhar as surname was mismatch and new pan was applied on the basis of Aadhar so it's match with Aadhar. Due to this both pan have different surname. Now what is the procedure to surrender old one ?