You fight for your livelihood right as per constitution of india, if those certificate are making your livelihood less or difficult. Make police FIR there will be some IPC section on this show them all your request to employers.if you do not want to take law into hand. Don't afraid of any body or anybody's opinion. You are not criminal and done damages to company right? Make forge document if nothing works. If they caught your forged document go to jail and tell jailer that livelihood is my right as per constitution of india and previous employer denied it and treated me as a slave by not giving those documents which I deserve because I am not slave who they bought it for money and after use thrown out. These employers must have earn lots of money beause you work for them under slavary and derived satisfaction from your work. Once you come out jail you again fight for your livelihood right as per constitution of india. Only slaves don't get experience or service certificate.