The seller is responsible for the accuracy of his descriptions. His problem is not yours.
But he is unlikely to ship for the amount you paid.
I guess $50 is more important to him than selling on eBay.
Whether you pay and are refunded or agree to a Mutual Cancellation, you will be able to leave feedback.
The most effective feedback is calm and factual. "Refused to sell for closing bid.' pretty well covers it.
At the same time you will be asked to leave Detailed Seller Ratings. The usual rating for a friendly transaction is Five Stars. The lowest rating is ONE STAR, (No stars is a free ride). I would be leaving ONE star for Communication and for Description. Since he refused to ship you cannot easily assess the two shipping ratings.
If a seller's DSRs drop below 4.3 he will find it harder to list or sell on eBay. Too low and he will be removed from the site.