School is delaying a payment of salary, security deposit and paid leave fund

I am Mohit Sharma, working as a faculty of English in a private school of my locality which is affiliated to CBSE New Delhi, I gave a resign a month ago and inform the management of school that, I can't continue after a month and giving a resign. But school management is not giving my current month salary with paid leave fund and Security deposit. Stating we have a lack of Fund so we will provide it in the next month without giving me an exact date. My notice period is going in summer Vacations so school is forcing me to do work for another month to complete a notice period.