I am having a buyer who use to purchase software and provide negative feedback very often. He change feedback every now and then, some times with 1 star some times with 3 star some times even with 5 then change back to 1.
The way he send me PM and change rating seems he is kind of sick.
Is there any way to avoid such buyers ? I mean can author reject the ability of buying or bought items for some peoples ?
Sorry for my bad English. Thank you