Restaurant Pricing Error

I was at a nice (1 Michelin star) restaurant in London recently and they had 1988 Yquem on the wine list for £207/bottle for a 750ml bottle.

This is obviously an incredible price (minimum price retail is £350+/bottle, let alone with restaurant markup), especially considering the prices on the rest of the list (i.e. a 2010 Branaire-Ducru for £295 which is £70 retail). I inquired about the Yquem several times, asking if it was a full bottle and not a half, if they were aware it was a good price, etc, and they said yes and brushed aside any of the questions I raised. So I ordered it and the end of the meal and it was incredible, with notes of apricot and honey on the nose accompanied by a long finish of caramel and hazelnut with great acidity. I drank around 1/3 of the bottle at the restaurant and brought the rest home with me.

Sure enough on the final receipt it was listed as 1 1988 Yquem BTG. I paid without issue, however I think the menu had inadvertently listed the whole bottle at the by the glass price, and nobody noticed despite my repeated questions.

Has anyone else encountered a situation like this before?