LEGALLY your friend is not liable to pay. However, LEGALLY they are entitled to demand repayment from your friend as long as he remains a director since you demand payment from a comapny through its directors.
So as long as the debt collectors do not trespass your friend there is nothing he can do. Might as well pay up the $1k.
Proper method is go court get a court to award you the money owning, then using the letter from court go seize company property etc. BUT director unless otherwise guarantor, if not DIRECTORS ARE NOT LEGALLY LIABLE to be harassed at the privacy of their HOME. Harassment can be done at the office where the Business is registered at.
I hope businessman in such predicament before can offer some light. Class95 with due respect please keep to your "iron" rich bowl eat your fill and keep your Class95 mentality to yourself.