See a lawyer and see what steps are needed to ensure you can legally prove you did everything necessary. Might be as simple as a formal letter from the lawyer i

See a lawyer and see what steps are needed to ensure you can legally prove you did everything necessary. Might be as simple as a formal letter from the lawyer informing the company that you completed all necessary steps. Then they know you are serious and are legally covered in being able to prove you qualified and performed all necessary steps.