Four of six not matching the photos is bad, but the part about wanting the exact unit is where I see it different. A lot of buildings run the same floor plan on different floors, so the office shows you the model or a vacant one on floor 3 when yours is on floor 9. That is normal and honestly fine if the layout is the same. What gets me is when the listing pics have a city view and your actual place faces a brick wall. That is the real lie, not the unit number. So I would ask two things up front, what floor and which direction, and make them say it in writing. If the photos show a view, that view should be part of the deal.