The basis of this appeal seems tenuous in the extreme, and I would not be surprised if it had led to a lost deposit. The 2NT bid is agreed to be 1 HCP more than might have been expected. That does not of itself make it game forcing. But in any case it's quite possible for NS to have 29 points between them. West has three tricks, without any obvious prospect of more, and in the process of taking them is likely to create two tricks for declarer. An overtrick in 3NT is the outcome that should have been anticipated by West.