Hinduja Global Solutions — haven't received experience letter

I worked with hgs but i was working for bfl pune station. I worked for 9 months, i received my provision letter, fnf has been proceed long back, 30th oct 2019 was my last working day 31st dec i gave 2 months for fnf and after that from 26th dec till 28th jan i kept on coordinating with hr tejashri deote but she kept on ignoring and giving me silly reasons for not giving me the experience letter. And now she has blocked me from whatsapp and calls. I request you to take a very strict action against her or else i will file a complaint against her because i have her all screenshots, call recording and everything. I want my experience letter at the earliest.