AFAIK feedback, whatever it is, isn't regulated on this forum. As for accusations they can throw them around, but as long as they have no proof and you are remaining transparent and honest they will be regarded as nothing more but Internet trolls.
It's actually funny. Quickseller has been trolling the forum for so long that people are starting to get suspicious of one another. Nobody knows in which thread he'll resurface.
Should I deal with this person or not? Better not, it could be Quickseller!