Terminated from school without advance salary/notice

Five months back, I joined the school as a physics teacher. On 28/11/2021 around 10:00 PM, the principal sent me an email terminating my employment with immediate effect without stating any reason. The next day, when I went to the school and inquired about the reason for termination, she stated that you misbehaved with me and the coordinator, Further, a girl made a complaint about you for lightly slapping her on the head during your class. When I asked her if she can provide me with a copy of the complaint made by that girl she replied there was no written complaint and that everything had been observed on CCTV in presence of one of the trustees. When I requested her to bring that girl before me so that we could resolve the matter amicably, she refused. Finally, when I requested a one-month advance salary and a written termination letter signed and stamped by the authorities, she denied it, stating that no salary would be paid and that the mail sent to you is a letter; no other letter would be provided. The reality is that I am being victimized and have not been given an opportunity to defend myself. Please do the needful.