I don`t know what country you are in but I would suggest that you obtain a lawyer immediately. Then you refuse your scheduled polygraph test.

You justification is that your lawyer advised you to decline their invitation for a polygraph test. You can further state that you don`t know why he advised you to decline but that you will respect his advice because it is his field of expertise and you feel that he is probably acting in your best interests. CASE CLOSED. NO FURTHER DISCUSSION.

Or even better might be to just get your lawyer to call and state that he has advised you not to do the test. He can further suggest that they go through him in the future and not contact you unless they plan on charging you.

PW