That image is clearly a LHD car flipped to RHD. Granted it's a very good bit of CGI, but the giveaways (indicator/wiper stalks, start button, rear seatbelts) are there... Misleading? Possibly. Have SEAT at any point lied to you? No. Were you forced to place an order? No.
But anyway, we could go back and forth like this all night, but it doesn't change the fact you made the decision to order a car that does not come with electric rear windows (just out of curiosity, WHY are they so important to you?) and nothing you do, say or "prove" is going to change that.
So, enjoy driving your 1.5 TSI EVO 150 (from the front seat) when you get it, and on the rare occassion that rear passengers want to wind the window down tell them there are far more important things to worry about in life than exerting that tiny bit of energy