If you indeed did try to charge him more, then the feedback would be considered the truth (since you admit to cancelling the order) and you would lose a defamation case against him. The only way Ebay will remove a feedback that does not violate Ebay rules (and as an Ebay seller myself for over 10 years with several thousand feedback, I know Ebay rules pretty well) is if you have a court order. To get a court order, you would need to win your defamation case. That being said, yes, there have been people that have been successful in suing those who leave truly defamatory feedback but there are very few and there are a couple of reasons why this is so. The first reason is that most buyers and sellers don't live in the same state and the cost of travelling to a different state to sue over a feedback on Ebay doesn't make sense to most financially. The second reason is that it is very difficult to win a defamation case since many of the negative feedbacks left deal with the buyer's opinion. Even when someone is successful in winning their defamation case, the monetary judgment is usually nominal.
The above is the legal aspect of suing for defamation. As an Ebay seller, I will tell you this. Ebay allows you to not only reply to the negative feedback (i.e. if you did not raise the price, you can state that in your reply and potential buyers will see that) but Ebay also allows you to ask the bidder/winner to retract their negative feedback. If you only have 66 feedback, my guess is that you are a new Ebay seller. It was technically against the rules for you (and a breach of contract
, legally) to cancel the transaction without a valid reason. Valid reasons would include, for example, if you find out that the buyer stole someone's account or is using false information. Your best bet is to try to smooth things over with the buyer and ask them to remove the feedback since it will cost you quite a bit to sue, even in small claims court.
Please let me know if you need any additional information. Thanks! Sorry that you had a bad experience with a buyer. Luckily, rude buyers are rare. I only get maybe 2 or 3 a year out of the hundreds of transactions that I do. More often than not, being nice turns them around!