My owner is troubling me to vacate the building

I am correspondent to a private school, in hyderabad,i have taken a building on rent, for school, as in covid time we have suffered due to lockdown schools are closed, at that time rent was pending, and that was accumulated as a figure of 5,85000 , I requested my school building owner , to please wait for 15 days time and I will clear his arears, but the school building owner with whom I have signed agreement, is not coming or calling me but his son is coming to school, and abusing me and threatening my staff saying that if they come to school, he will lodge a complaint, as rent is not cleared he is going to lock the school, yesterday while school is functioning he came and displayed banners around school premises that the said school will be closed from tomorrow and locked the premises and threatening me. With great effort I have managed to send students to their home and today the school is closed, even iam requesting him he has locked the entire premises gates. Plz show me some legal advice, so that my owner will not harass me