Indians who initially plan to come to Poland but At last they left out by which his money gets wasted.
That's his problem Narinder, not yours. One of the realities of running a business is that you incur certain costs/overheads. If an employer wants to bring in workers from abroad, it's the employer's responsibility to bear the costs of that. If applicants for the job let him down, that's part of life when you run a business.
In your original post, you gave the impression that you were coming to Poland to work in your profession of marketing and you were advised that it's not a good time to move because of the pandemic. Coming to work in a restaurant is a much worse situation for you as restaurants have been closed except for takeaway services for almost a whole year. Many, many restaurants have closed down permanently, gone out of business. There is a possibility that after 9 April, we will have an even stricter lockdown because the virus is getting worse and worse here. You would be better off using your money to invest in some good business English classes on an online platform or perhaps start learning Polish with an online platform, if you have a long term plan to move to Poland.