This guy blackmails people to get a positive feedback. This is the message I got from him:
'OK, I want to cancel this transactions, just leave positive feedbacks with only word-> "Thank you", then i will send you cancelation. if you won't send me positive feed backs in 1 day, i will open unpaid case. just leave "thank you"
I already payed for all the items and he has sent me an unpaid case for a previous purchase.