Not giving salary and experience letter

Hi, I was working in a company where I had reported about the manager bad behavour.after which they were intentionally not giving timely salary.They didnt gave me salary for continuous 47 days for which i resigned.I mentioned all the things for reason of resignation like toxic work cultutre,boss shouting and non payment of timely salary.I had a notice period of 2 months.They wrote in mail that they could have terminated me of falsely accusing of bad behaviour by boss but accept my resignation on immediate effect.They mentioned some exit formalitites that I have to make a video of my experience which i denied and left.I have mail of them in which they have accepted my resignation on immediate accept. Now when i mailed them asking for salary,they are telling that handover and exit formalities are left.But why would i make false experience videos.also they are not paying me salary of 47 days and not giving me experience letter.They mailed me that they will contact my next employer and give negative feedback.