Labour ban for resignation before completing one year

I have got a 1-year ban because of leaving my previous job in 6 months and now I have an offer letter from a new company.

They are going to process my visa under unskilled labour which was the same in my previous contract. I want to know if this gets rejected, will I have any legal claim against the company who offered me a job?

Also, they took my visa copy, passport and Emirates ID copy even before issuing me an offer letter. So I assumed they would have already checked my eligibility to apply for a new visa.

Please guide me