|How did you send payment?
Credit card? - simple, call the CC company and request a charge back. The part was never delivered, the CC company is on your side.
PayPal? - simple, contact PayPal and dispute the transaction. Same as with the CC company, they are on your side. Unless... If you sent PayPal payment as Friends and Family - then you lose, you have no recourse.
Personally, even if the part was magically delivered today, I would reject it. Because why would you want to promote this guy's part and business ethics by using it after such a shitty experience? Then I would go on a vendetta to make sure as many people as possible are warned about how bad Ash-Rash hurts. You won't find many people here on TT.net who don't already know, Facebook is his life-line.