TENANT THREATENING LANDLORD

I don’t live in the same city where I have given the flat for rent. I have given my flat for rental purpose and the renter has to pay all the electricity bills, but the renter has not paid electricity bills for a long time, and now there is a big bill amount and the electricity department has cut the power supply, and the renter is connecting the electricity connection by himself, without telling or asking nor had cleared the electricity bill (which I think is illegal). Also, I have asked him to vacant my flat from December 2020 but he is just giving dates after dates to vacant but not listening, after this incident when I asked him about this and said to clear the electricity bills and vacant my flat, he said that he will not pay any amount and nither vacant the house. Also, he has not paid the rent for one month and the rest rent he has paid is also not on time. What should I do?