I was annoyed that they had this attitude and sent them a note the other night to tell them to think about what they do and they sent back a nasty note and I replied again and then they gave me an unfair negative.

Maybe it would have been best to have just left well enough alone....the sale had been cancelled so your email to them was not really necessary and could have been the reason they left a negative when they may not have bothered to leave anything otherwise.