I am seeking your advise on my job. I should say ex-job.

I work in school in Gurgaon Haryana, I have a complaint with the work system of this school.I have joined this school on 5 March 2017 as a PRT English Teacher. I passed the interview and joined without any reference. Things are going well, I was punctual steady and honest in my work but all of a sudden they told me to quit on 24 may 2017 without any notice period and asked me to give resignation letter.Although they have not provided Appointment letter to me, whenever I asked for it they always made an excuse. I am not ready to give any written consent to them because willingly I am not leaving the school.Sir, I am a single parent, i have a 9-year-old daughter and she depends on me if I will quit the job how I will survive. I am living in rented house and not any other option i have for income.Admin person has threatened me and said: "Araam se le lo aaj tak ki salary warna terminate kar k nikal denge aur yaad rakho akele ho aap Gurgaon me ". I am not supposed to work like this . I had already talked to the Principal Sir and coordinator mam regarding this issue, however, he said that it's not an issue its a pathetic school