Landlord Harassment — Landlord refused to return security deposit,asking for extra money in the name of cleaning and renovation and also not returning few electronic goods.

Landlord refused to return security deposit money and also kept few electronic goods which we left there while vacating flat due this covid pandemic. Now he is asking for extra money citing the cleaning and renovation work, then only he will return our electronic goods.
He kept pressuring us for rent during pandemic even after government order though somehow we sent him money but this is unacceptable and just inhuman. I can't let go my parents hard earned money.
I need help, i'm in different city and can't go there and complain.
Too much time has already passed.
Please Help.