I'm I at fault for the $14,000 even after I was told nothing else needed to be done on my part?

I signed a lease with an apartment in August 2019 and the lease was meant to be done in August 2020. I moved out June 2020 after contacting the property manager and leaving the keys in the drop box; because of Covid-19, they were not letting people in the office. I am aware that I would owe the apartment the remaining month rent due from June to August which is between $3000-$4000 but they are trying to charge me market value until February 2021. I received a court notice in April 2024 and when I tried to call the attorneys representing the apartment I was told I did not need to contact the court unless I wanted to and that everything could be handled on their end, meaning the dispute. I tried contacting them 10 times between April of 2024 and June 2024 and only got a response twice. I was told by the case worker that she would send me dispute paperwork and she never did, just copies of my lease. I was never given the opportunity to dispute the case and court proceedings are beginning.