Birthday humiliation

It was my daughter's 18th birthday celebration and so we booked a table for 12. After having looked at the menu online, everyone was certain as to what they could afford (teenagers and all) without breaking the bank. Table decor had been arranged, a special cake had been arranged, drinks orders were placed and once everyone was ready to place their orders, they were informed that due to it being Ramadan, they only offer buffet style and charge per head. In an absolute panic she called home to explain the situation and when my husband went to the establishment to sort out this confusing mess, he was told by the manager "But everyone knows it's buffet in Ramadan". Clearly we knew nothing of the sort as we had scrutinized the menu and there was no mention of any Ramadan buffet. My daughter was in tears feeling like her 18th birthday had been absolutely ruined. Quick, wit thinking from her friends, they managed to get a table at Crystal Towers at very short notice who did their best to accommodate the party. After having to fit the bill of R600 (incl. their 10%) service charge. All they could say was that the kitchen is closed already. What an absolute nightmare of an establishment who just arrogantly assumes that people should know the the menu changes without any indication thereof in their website, no mention of it in the email correspondence and none in the phone call prior to making a reservation. As a regular attendee of the restaurant, I am actually appalled at how this entire situation was managed and the fact they they didn't even care that she no longer had a birthday venue was simply atrocious.