Anyone can say "feedback pls" after declining the trade. Why did you not take a screen shot in the trade confirming his rs account or anything?
He has a screen shot of a declining trade and that you didn't pay him, what do you have? You don't take screen shots of trades? I would like the full chat logs not cut off.
Because they posted a dispute, that makes you look guilty
Yes the note helps you with chargebacks after a scam.