The band can only be reviewed when the property is next sold, i.e. if you have an extension they can't change it but the next owners might get a nice surprise!
That does sound odd! You have to assume that they reviewed it at the right time, but for some reason reviewed their own review. That would suggest it is a borderline case unless their original review was miles out. So I think it is worth appealing but you're going to need to provide some...