User Activity

I have a buyer who hasn't paid and won't communicate. When I read her previous feedback, all ratings are positive but there are at least 15 negative comments about non payment, no communication, don't deal with this customer etc.Why don't these selle...
Every time an item is relisted I get a message that it doesn't meet requirements for top seller rating and needs to be updated. This has to do with free return policy, which I am not willing to offer. It is easy but time-consuming to deal with each i...
I've many items under two categories, Is there any way to revert to just one without ending each item and listing again? Also is there any way for me to tell which category buyer used?
I have agreed to a lower price with a buyer, how do I organise that with listing?