Regarding documents

The school has to make an endorsement in the marksheet stating that the duplicate has been issued on .....date with their seal and signature.

You can approach the education officer with an application venting out your grievances and request them to intervene and direct the school to issue a proper certificate.

you can approach district education officer with your grievances. A District Educational Officer is an educational professional employed by the government. He or she is responsible for inspecting, appointing, promoting, attendance developing, and managing education policies of functioning of education state-run institutes within a district.