Issuing a work ban against an employee due to joining another company?

Dear sir/madam,

I have been working as an accountant in a private company since October 30, 2019. The company visa was issued on 20th March 2020 and I had a 2-year unlimited contract.

My visa will expire on 20th March 2022. I got a new job offer and they asked me to join after 18 days and accordingly, I submitted 18 days notice period and on November 1, 2021, I signed the offer letter of the new company.

The resignation was submitted via email on November 2 and a hard copy was also submitted to HR. On November 6, my company owner called me and told me that I would not be allowed to go and if I am trying to go, he will ban me for 5 years.