Birth Certificate — refusing to accept the change in birth certificate

Address:

Dindigul, Tamil Nadu, 624002

Initial of my son's name in tamil is not as per the initial we have mentioned in the form. When i reached out to the officials of dindigul municipal office on the day of issuing birth certificate, they refused to accept the change and tried to convince me to go with that. They said it's not possible to do it. Shouted at me and treated me badly. But same change has been done to the another friend of mine. How is it possible to do it for one person and not for another person.