In France when 2 People says yes, there is a contract between both of them.
You proposed me an account available + we agree for the price + you confirmed it by a yes. After it, I was waiting for 4 or 5 days an answer and you finished by told me : ohh I will not sell you the account, it is not available, you are not my only client, meaning that you did not care about me as a client and you just let me like that by saying you could sell it more expansive in the future. I proposed you a price biger than the one we matched before because you told me that you wanted to sell it more expansive. And again you did not answer me for 3 or 4 days to finaly told me no...
If you say no, you need to confirm something do not say yes to a client and come back 5 days after to tell him : I said yes, but today it is not available. You told me that you are working like a company as professional. At least, this was not professional...
You think that all feedbacks need to folow a payement but a feedback it is the conclusion of something good or bad.
I just gave you my feelings after this situation because you did not care about me and you told me that you were tired... Don't you think that I was not tired after all my waiting and I was texting you when you just ignore me ?
How People can know who you are if they only see your good face ?
In my opinion, it's too easy to do what you want by saying yes, then no, then yes, then no to finally launch a forgiveness that is not thought of, and when you realize that the person felt concerned and said it, you ask for a cancellation of a constructive comment.
It is the principe of a feedback to give an opinion on a service and the next time before making any promises you will think twice before giving a positive answer, letting the person hope and in the end refusing everything.