User Activity

This is happening more on eBay, someone bids, wins then has no further contact with seller, is negative feedback the only redress
Is there a way a seller of an item can contact a bidder on that item 
I've advertised an item on eBay which is bidding up to more than it's worth, can I contact the bidder and advise them on this
If an item is advertised as cash on collection and buyer pays via PayPal, can they be refunded and cancelled
0
Kudos