Is it illegal for a company to use my personal information for promotion and recruitment?

The company’s behavior violated your rights. The company can learn your personal information through various channels. But this does not mean that the company can privately use your information to conduct commercial activities without your consent.

If the company releases this information to the public without permission, it will violate your right of infringement of privacy. They can be held accountable for infringement. The premise is that you no longer want to work in the company.