Ulhasnagar Municipal Corporation — no surname in my birth certificate

Hi sir/madam, my name is dolly dias, i was born on 10 feb 1991 in ulhasnagar. My birth certificate does not have surname on it. My dads name is also incorrect. His name is daniel. R. Dias. And i presently stay in goa. Recently i issued a copy of my birth certificate which had wrong details on it. So in 2015 i had come to ulhasnagar, mumbai, to correct my birth certificate as i was asked in one office my recent birth certificate. Before my dad too had come in 1995 in ulhasnagar for correction. He had corrected his name on gazette and given the copy in muncipal office as requested by the office. And muncipal office had give him certificate saying it is corrected. But recent birth certificate in not showing correct details. So i asked them to change but in municipal office they said they can’t do anything. And why i have come after so many years. I told the my dad had come, they said bring your dad to verify. My dad was dead years before. Before i didn’t have problem with my birth certificate as i was attaching my same certificate for all purposes. I had struggled lot in the municipal office for corrections but they didn’t helped. Please help he to get my certificate corrected. Please let me know whatcan be done. I can also show my official gazette copy and old and recent birth certificate if you wish.