>I'm pretty positive I'm in full control of this company
That you don't know pretty much guarantees you have zero legal control. I assume the corporate entity is not in your name. Domains, hosting, etc are all very easily gotten from you by a single letter from a lawyer. You will likely hire your own lawyer, and you'll essentially be paying him to tell that you have to cough up, because you'll lose in court, in addition to tens of thousands of dollars and a ruined reputation.
That you don't know pretty much guarantees you have zero legal control. I assume the corporate entity is not in your name. Domains, hosting, etc are all very easily gotten from you by a single letter from a lawyer. You will likely hire your own lawyer, and you'll essentially be paying him to tell that you have to cough up, because you'll lose in court, in addition to tens of thousands of dollars and a ruined reputation.