'Deceived' is a bit strong. All manufacturers use WLTP test results in marketing, and should be taken with a large dose of scepticism. No-one promised anything, they use language like 'up to' - and you may well find you do get much closer to that in warmer weather and ideal driving profile. For now, approaching the depths of UK winter, I'd say we're probably on a hiding to nothing complaining to the dealer about it. All cars suffer worse consumption in colder conditions whether that be petrol, diesel, or EV. This shouldn't be a surprise to anyone. Deep discharge of lithium batteries is very bad for them and they don't like the cold - just facts of the technology.
The CX60 does seem to have some strong battery protection and is therefore retaining a larger % of battery as the weather gets colder. My own approach is to accept it for what it is and I fully expect available EV range will vary across our changeable temperature seasons - so at the moment (in UK) it is approaching worst-case. As ever, YMMV, literally.
The certificate of conformity says 65km. It doesn’t say cold weather 25km ( -1 Celsius)
By the way I am fine with a real range of 42km, that’s a drop of 35%. But when you have a drop of 62% this is misleading and deceiving