On the pic you provided is says the USD price in a much bigger font and the BTC price in brackets, much smaller and some lighter shade of gray. All that is on the left-hand side of the "invoice" which concerns itself with the price. The right-hand side concerns itself with the payment process.
Thanks for suggesting your point of view, molecular. I have never had any special interests in Impressionism (soleil levant), you know, all those shades, colors, forms, brush strokes, emphasis, accurate depiction of light and nuances. I'm afraid my knowledge in this field is quite inferior to yours.
All I know is that all the data in an invoice is equally important independently of color, size or place of the fonts used!
Well, I can say one thing kind-of in your favor (not siding with you at all though): They should've clearly stated the fact that you were actually selling your BTC and paying in USD when making the transaction.
Only because it's been clear to me from the way bitpay works and other context doesn't mean it's clear to everyone.
It looks to me like you made a mistake (in thinking you would get back BTC) and now the situation is pretty bad for you and you can't admit you made that mistake (maybe even to yourself). Now you're attributing the mistake to someone else quite irrationally.