On February 17, I submitted a best offer which was accepted by the seller; payment was made immediately The item has not shipped; it has been 10 days. I contacted the seller and they have not responded; it has been 3 days. The seller has 100% feedback. What I did not realize is that they had numerous negative feedback which are older than 12 months. Any advice on how to proceed. Also, what is going on with many of the sellers. I always...

Sellers cannot leave negative feedback for buyers.