Ha...I'll tell you, I had the same thought when I booked my romance package in Charleston, SC. I pretty much knew they would be giving me California Sparkling wine, but I was ready to argue my point to the management about it specifically stating "champagne" on the advertisement. Unfortunately, the bottle they delivered was actually labeled "champagne"...although by French standards, it obviously wasn't. It was some California brand, but I can't remember the name to save my life.
It's a smart marketing move on their point. Is it really their fault that the particular bottle of wine they are selling chooses to disregard international naming conventions when it comes to serving wine? Given the fact that the word "champagne" was on the bottle, I decided my point was sufficiently weak enough to avoid ruining my girlfriend's good time by starting a fight with the hotel