Concordia Hotel, Venice

I booked a room for 2 nights, at the rate given on their website. When I checked out of the hotel, the bill I got was over 50% higher than the rate on their website. I tried to work it out with them, but they were rude, and just insisted that their computer is never wrong. Finally we agreed that I would just pay the higher amount, then when I got home I would email them proof of the booking price, and they promised to refund the difference. It was so uncomfortable arguing in the lobby (on our honeymoon) that I agreed. But when I got home and sent them multiple documents showing the price, INCLUDING a picture of the computer screen at their website, which even a month later STILL showed the lower rate for that room, they wouldn't refund the difference. They said that that room I asked for was not available, so they booked me into the more expensive room...only they didn't discuss that with me, if that was even true. After a short email exchange, they stopped returning my emails. The hotel was already overpriced at the price on their website (that I agreed to), but add 50% and it's a ridiculous amount of money for a pretty much regular type of room. This is not right, so please don't reward them with your business. Thank you. Michael