He must give it back to you. If you encounter this kind of clothing, you have to pay a deposit and you can't work there. It's definitely not a good enterprise. But the deposit you paid was written in training fees, and he just didn't want to return it to you. If he doesn't pay you back, you can only say that there is no receipt for the clothing deposit. If he doesn't return it to you, you can report it directly to the labor bureau.