Employer asking for Succession certificate even after nominee is declared

My late father was working in a Delhi based company and he passed away in may 2021. My mother earlier passed away in 2016, I am the only child of my parents so my father declared me his nominee everywhere when my mother passed away. Now I want to apply for PF, Edli (as he was working at the time of his death) and want to get his gratuity etc in the form of full and final also Its been a month since I am following up with the Hr of that company and got no cooperation (he never told me how to apply to apply for PF, deli, just asked me to mail me death certificate of my mother and father, my adhar pan and kept me waiting) I finally went to PF office and got the composite form and noted down the required documents now its been a week I have filled and submitted these documents to the Hr which needs to be signed and attached by the employer and to be submitted in PF office so that this claim process could start Its been more than a month since I contacted him first regarding this claim and its been a week since these documents are with him and now they are saying we don't know you , you need to get a succession certificate and don't call us till you don't get succession I am a nominee in PF, bank, Dmat etc of my Father and after a month they clearly refused to sign and attach PF, e Dli claim documents and do full and final Can an employer do this when I am the declared nominee? I am already facing mental issues and my father's employer is treating me this way What should I do? Somebody please reply