Yeh he sounds dodgy. His excuses / sad attempt at "playing dumb" would be enough for me to warrant an escalation to a paypal claim. Just buy it somewhere else. As for the feedback, can't you retract the positive hit and leave negative? I think you can request it to be changed or modified can't you?

Also, on a side note; looking at your sig liege...in my eyes you can't complete G1 until you have bomb bursts left shoulder pad! The time I've spent trying to help you find one is starting to make me think even I need this missing part for my own collection...and I don't even have any of the pretenders