Gargi Agriculture Research And Training Institute - College is denying to give salary after proper resign

Dear Sir/Madam,
I have been working at Gargi Agriculture Research and Training Institute (GARTI college), Nashik from *rd Jan ** to **rd Jul ****. They have kept my first month salary as a deposit on condition to be returned if I will resign on completion of semester. As I resigned on *rd July **** when the semester was completed and results declared for same. The college has denied to give me my salary amount (Total Rs.*****/-) which includes first month (Jan ****) , second last month (Jun ****) and * days from last month (Jul ****). I requested many times the college principal and management, but they denied and said me to do whatever I can do.
Looking forward for your kind cooperation,
Thanks,
Sincerely,
A victim