Company will not giving me releiving letter

Dear sir/madam, Iam one of the ex employee of TATA AIA Life Insurance company Ltd.iam regisn from my duties on 11-4-19.i resign from the because iam providing a false document at the time of joining.that is my mistake I will agreed,that why I resign from my duties and hand over all the company asset to the company.Hr told that I will get all my f&f and relieving letter after 90days,I will agreed,than after 1month I join a new company the company ask me for the old organisation relieving letter after 2month, I am regularly follow up to previous company hr regarding my relieving letter and f&f settlement,Since from 3month they reply me it’s in process.in my mail iam always mention the word reliving letter,when I get my relieving letter,after 4month Mr.sanjiv Biswas hr of Tata aia life,mail me that company is not issuing me the relieving letter,because I am providing false documents due joining. Than why mr Biswas is not reply in my earliest mail.why they mail me the same after 120days. Sir,kindly suggest me what can do???? Regarding