HDFC Bank — Not issuing relieving letter

This is in regards to my resignation dated on 25th August 2021. I have constantly being in touch with the HR and My manager as well as my cluster head about my early reliving. These people are pushing me and forcing me to serve the entire notice period even when I have asked them to pay the remaining amount. I have served my notice of one month and these people are making me absconding even though I have properly resigned intimated my last working day along with proper handover of my stuff. This is a total mental harrassment. According to the law you cannot force an employee to serve the notice. They give unnecessary pressure while you are working on the job when I said I don't want to make my career into this field they are threatening me if I try to join some another company. please help me out with this