Booked a table for 6 they said no problem. We show...

Booked a table for 6 they said no problem. We showed up and they sat us at two different tables. We asked to move and we're told the restaurant was completely booked. I understand being booked but don't take a reservation for 6 if you don't have a table for 6. Or at least tell us beforehand that we will be at two separate tables. Waste of an evening.