Cheque Bounce Case

Hello I worked with a web development firm in Ahmedabad. When I joined they told me that 1 month will be training without any allowance and after that 2 months they will give me a stipend of 8k rupees till my probation period (next 2 months) ends. After that, they have given me the offer letter and mentioned that I'd joined as a trainee and the salary will be the same for the one year. Actually, that was not as per our discussion. I signed this offer letter along with one agreement. Besides this, they took 1 cheque as a security amount along with 1 of my original document. After this, I told them to exchange my offer letter because they mentioned the same 8k for one year. So they didn't give me an updated offer letter and after the probation period, they did not give me an appointment letter as well. After completion of a probation period of 3 months, they gave me the same 8k salary which is not even a minimum wage. I told HR many times but she didn't give a proper answer for 8 months. Also, my last month's Salary is pending, all my overtime payments and they didn't give me my original document till now. So I decided to left the job because of their unprofessional behavior. and finally, I tendered my resignation in November 2020. So now they filed legal action (I'd received court samans under section 138) against me that I left the job without serving a notice period. And a bank cheque that they have taken from me is bounced because they haven't transferred a single salary into salary my account (At that time they'd transferred all employee's bank accounts to another bank). So I just wanted to know, My employment considered a legal, as well as minimum wage, PF, ESI (Gov. Mandatory Acts), can be applied in my case? They haven't given me anything. So, please suggest to me what should i do. Looking forward to your advice on this issue. Thank you.