Regarding DOB issue

Sir/madam, My daughter is 8+yrs and her DOB is 30.10.2012 as per Birth certificate issued by Gram Panchayet. I am an employee of NTPC Ltd.(PSU) and my daughter was born on 07.09.2012 at NTPC Hospital . So, her DOB was recorded in my service profile as 07.09.2012. Now, my dept. is not accepting the DOB issued by Gram Panchayet because they have the NTPC hospital record. I approached 2~3 times to the Panchayat with hospital record for correction but every time they denied saying that DOB can not be corrected. Recently, i discover that the application form filled at the time of applying DOB is in my wife's handwriting but the date of birth portion is not in her handwriting. As per senior clerk of that panchayet(unofficially told me) that...probably the middle man who engaged on that work, put the birth date as per their suitable date to maintain their record serially. because i applied for DOB after 1 month or little more. So, what should i do now? AS PER WEST BENGAL STATE JUDICIARY SYSTEM.