Company not issuing Experience letter and full and final settlement amount

Hello sir/Madam, I need an advice as my previous employer has refused to issue my experience letter as well as full and final settlement amount. I was released from my previous organization on 18th dec 2021. I got an early release from my previous organization as i requested them due to my father's health. I had 60 days notice period in my previous organization but due to my request they agreed to release me early after 39 days. I also shared my fathers reports with them which they agreed on. After few days i got one opportunity and i joined new company. Now when my current company contacted my previous company for background verification my previous company came to know that i am joining new company. So on this basis now my previous company has refused to issue my experience letter stating that i have given false reason to seek early release which is not true. As i have already share medical reports which they also agreed upon. Secondly, i was not having any offer till my last working day with my previous company. They have issued the releiving letter to me already. Kindly please any help.