Don't sweat it - most people know a 30 minute review complaining comes from exactly what you just said.
I have no idea why someone thinks a 30 minute appointment is GFE expected. But then again, I don't do them. The majority seem exactly like what you explained.
It is a shame that even with texts, ect, the review won't come down. I have often thought of putting a 'no review policy' when I hear stories of provider review 'blackmail' from clients. We all know they do it, and often, but of course we can't say that, right? Oh wait, I did.
I am so sorry this happened to you. I know it seems a huge deal, but you WILL get better reviews I am sure. And don't forget - pointing out bad reviews to you are just as manipulative at times. If they want to see you, they will. These 'potential clients' may simply be using it as the infamous "If you discount/give more time" leverage they seek.
It is not all clients, there are wonderful ones. But it is a pattern that can and does happen. Certain cretins think they are clever, and want you to reduce your rates. I knew one lady who raised her rates, and guys on a private board decided to 'starve her out' til she dropped them again. It was so sad, and didn't work - because quality clients don't play that game.
Don't let this rent space in your head, it's what he wants. Move on to positive things. I wish you the best! Remember, there are truly wonderful clients out there - in times like you are going through, it's easy to forget