Dear Anupam,
The defenation is correct given b y you, By approaching the Local authorities, they will guide you better regarding the proceeding and the method for going further, Simply you cannot hire a advocate and fight,
When Manager's are facing problem than how come the people under them are safe, going to labour authority will dig it deep and get benefits to all the workers that is why you have to approach the Local Labour body first. This itself will create fear in the employer and will come down immediately with alternative and solutions.
Regards,
SIDMAN