Is it permissible for a worker to bring false witnesses to testify on his behalf in order to receive compensation for his accrued vacation days, which the company refused, based on its previous system that rewarded him for them, not its current system that limits that, knowing that he will not be able to obtain his right except through that method?

A witness is not permitted to lie or swear a false oath, for uttering falsehoods and bearing false witness are grave sins. If the employee has a right, he should inform the judiciary of the truth. It is not permissible for him to lie or deceive in order to obtain what is not rightfully his. Just as the company is not allowed to oppress him, he is not allowed to seize its money unlawfully. A judge's ruling does not make lawful what is unlawful, and whoever wishes to bear witness should bear witness only to what he knows.