Will I get a ban if I leave a company who forged my labour contract signature?

I am working for a company. They had submitted a labour contract without my knowledge.

They got a fake signature mentioning only 500 as a basic salary for a job of sales, while I am working as a business development executive in the company.

They also charged me for the visa. I have evidence & documents to prove my claim. I am waiting for my probation period till February 2019, while I got another offer from another company.

My labour contract is limited-term. Will I face a 1-year ban or I can to transfer my visa to another company?