Employer Put up 420 IPC against My Gratuity and salary

I've left my Administrative job in Covid period AUG-2020 , I was working for this company from 2013 and my employer didn't gave me salary from may 2020 to Aug 2020 . After multiple time asking for my salary they've asked me to put my paper y saying that they don't require my service anymore. As I am retired army officer and my health conditions were also not good I gave my resignation ,Also they've accepted the mail but they didn't let me do the handover process . After coming back to my hometown I have asked my salary and gratuity several times on mail ,but no response came after certain period they've reverted claiming that i need to give a sum of 100000/- as a recovery , following to this allegation they've said that they actually deducted my salary , my gratuity and the rest amount of 1 lac need to pay from my side. Due to this false allegation I have sent a complaint to labor court in which summon has been made against my employer but this week I came to know that he had summoned written notice by magistrate under IPC420. I have been called by police to present my documents now. Let me know what else I can do legally and i have all bills and documents of the materials i have procured within my tenure on which my employer had produce same bills to govt institutions to recover money against those bills. Let me know process