dob of an assessee

i want to see the our clients form 26AS in my accounts, but it is say's that wrong dob, and i m also unable to open the itr acknowledgment bcause of wrong dob, on PAN card it was mentioned as "ancestral". but our auditor gave me a DOB of an assessee,  last year i simply open with the that DOB & PAN No., but dis time i will face the pblm, and still i did not send the same to bangalore, wat will i have to do,

how can i found the correct DOB of an assessee in the website.? is their any other way for dis......