On the topic of disputing feedback.... I think it was last year i ordered one of the SDCC exclusives from an ebay seller. A month or two after the order i contacted the seller a couple times asking what was up as the item was being shipped and in peoples hands. Each time i contacted i got no response. At this point i figured either the seller oversold, or sold too low (price rose dramatically after my order) and was just ignoring me, or they never had any to sell to begin with. So i filed the INR case after not hearing anything from the seller in weeks.
Sure enough ebay promptly refunded me once the case was opened and i left negative feedback. This feedback wasn't mean or rude, something along the lines of "Never shipped, no contact from seller, would not recommend". Almost immediately afterwords i received positive feedback from the seller that said something like "F@!# this c@#!sucker" Had a good laugh, quick phone call to ebay got the feedback comment removed, but not the additional +1 positive feedback, so thanks for the free positive bud
Sellers account disappeared after this, so either it was a scam account that was removed, or ebay temp banned them or something for the language (they did mention they were going to penalize the account due to going against TOS with the language).