I rented a hotel's conference hall for a meeting. Despite what the brochure promised, the projectors didn't work properly and there was no screen. What can I do?

How much did the missing projector actually affect your event? Based on that, you can claim compensation or a refund. But be careful: if you went ahead, used the hall, finished the meeting and raised no objection beforehand, obtaining compensation becomes harder. So even if you do proceed, it is important to send the hotel an email and a message that amount to a reservation of rights before or while you use the venue.