eBay

Left wrong feedback for buyer and need to change it

I've just started back selling about 3 months ago. I've already had 7 people not pay for their winning auctions and that's from selling less than 150 items. My issue is why it's not posted on a buyers account when they don't pay. I've called eBay and...

Buyer wants to cancel his winning bid 12 hours after the Auction ended. If I do it will eBay still charge me their fees?