What should I do?

I bought a part from a member here, and paid what I thought was a fair price. I got the part and its not what was advertised and it is rusted to the point of not being a useable part for me. I got it over a month ago and sent a message to the seller about the part not being what is was supposed the be and of the rust condition. He told me he would make it right. I didn't hear anything for a month so I messaged him. He said he had more than one of these so I asked about the condition of the other parts and he said he would send pics of the other one,that was a week ago and I don't have pics. I paid about twice what I would have if this was a usable because of the way its was represented in the ad. I paid PayPal friends and family to save him the fees so I probably have nothing there to file a claim. I don't know if I waited long enough to name names or not. I see he has more parts he is selling and I don't want someone else to get screwed out of their money. I lost 500.00 out of my car budget with this guy. I have bought a lot of parts here for my car and all have been really good transactions. Buyer beware.

never , ever pay friends and family , paypal fees are cheaper than getting junk parts .