Rude staff ruined the mood. We had to pay $20 to g...

Rude staff ruined the mood. We had to pay $20 to get on to the roof, which would be redeemable on an overpriced drink (cocktails around $22 and a Stella Artois 50cl beer $20!). The vouchers are made of paper and mine blew away in the wind when I set it on the table for a moment to look at the menu. I looked at length but couldn't find it. I asked if we could use our receipt to pay for a drink (we obviously had not ordered yet) and a staff member asked us to wait while she got the manager. She disappeared for the rest of the night. After 20 minutes I asked another staff member who was extremely rude and patronising and left us to wait for another 40 minutes until I demanded to see the manager. Another 15 minutes later the manager came and finally let us have our drinks that we'd pay for at last. Bad service, overpriced and overrated.