User Activity

These POP UP ADS have started again to the extent that they are on 3 sides of my screen and are infringing on areas that I am trying to look at and I recently missed on a purchase because of it
If as a Seller I send the Invoice to the Buyer and ask when they will pick up and pay and no reply.A second request has been made and still no reply, how long do you wait before relisting.
Why was my feedback deleted regarding a bad seller 
If my item does not sell doesn't eBay not charge fees?
i wish to stop a sale, as nobody has bid is this ok?
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