Nice location and set-up, but the worst customer s...

Nice location and set-up, but the worst customer service experience we have ever had. Arrived to find the double room we had prebooked 3 months before was 'not available' and instead we were given a single room with one single bed to share. After much arguing and complaining the hotel offered a refund of $25 on a $250 a night room - not even the difference between a single and a double room. Easily the worst customer service I've ever seen, we moved to a lovely hotel in Tribeca instead. Shocked to see the Marriott would put their name to this...