Dear Friend
Pls tell me the mistake has accured in you PAN of name is from your side or from their side
means as per your records and form filled by you which name written on that form in Block Name printed on PAN Card.
Now fill Form 49A (Form for Correction is PAN and select change in name option)
and also attach your D.L, Passport, Voter id Card etc min two for correctness (for easy way) and copy of current PAN Card
and if its your mistake means you were previously knowingly with PAN Card name then give adver. in two news paper abt change of name then attach also Affidavit or simply written on paper and it must be attached by from Gazz. Officer/Doctor etc
Regards
Nitin Grover