Galaxy Global School - Non payment of salary

I was working with Galaxy Global School, Rameshwar Shikshan Sankul, Near Kunj mall, Nikol-Naroda Road, Nikol, Ahmedabad-****** (Gujarat) as a Primary teacher from April-**** to March-****. I left the school after completing March-**** (i.e. **st March) for better future prospects of myself. At the time of leaving I have been informed that salary for the month of March will be paid to me in the first week of April-****. Till date, the payment is not done in between I have called numerous time to school authorities for release of my salary payment but most of the time they did not receive my calls and when received they have extended the date of payment by one or other unjustifiable reasons. I got a call from school admin staff member Mr Sanket Bhatt to meet personally for the salary payment at school on **/**/****. I met Mr Sanket Bhatt at school and ask for the salary payment on **/**/****. He misbehaved with me and told me to give an apology letter that I left the school and joined another. He also threatens me that I will go to your current school and mislead them. Finally, they have not released my salary payment. I would like to lodge a complaint against school authorities for not releasing my salary payments as well as against Mr Sanket Bhatt as he threatens me in an unethical way and harasses me mentally.
Hope this will be taken up further and help me out.