What documents is required for digitize old birth certificate

Is discharged certificate is required for digitalising my old birth certificate ? I was born in 2007 i recently gone to Madhyamgram municipality to make my old birth certificate digital after given my parents adhar card and other documents at last he asked for discharged certificate i don't even know what is that I came home asked mother and didn't find any documents named that the guy doing was very rude and didn't even tell me what discharged certificate is