My friend was working in a private company since 2019. The company didn't provide him offer letter or any facilities or any deductions on salary. Due to the inappropriate behavior of his boss, it was impossible to continue, so he quit the job, He informed them and they accepted that. But now they are not giving him the salary of the time period that he has worked. Even they are telling him that he should serve the notice period before leaving. As he calls them for salary, the director abuses him and told him that they will check all the work and find the mistakes and file a case against him for the recovery of penalty or fine. As the director doesn't want to give salary she applies wrong allegations on him.
Please guide for the same.