They had no indication as to which door they were supposed to go through or how to get through it. There was nobody in sight at the facility. After trudging up a few flights of stairs and back down again, they elected to ask some students passing by where they could find a hotel. Fortunately they were able to find a place that had a vacancy.
Then they had to fight the OTA for a refund. Fortunately they are retired and had nothing better to do all day long than call them until they finally gave a refund.
I've had a couple of really obnoxious problems with OTAs involving event tickets. In one case I bought the wrong type of Disneyland tickets. I had to purchase different tickets once I got to the park. Then trying to get a refund from the OTA was a living nightmare. After about a week of daily calls I finally reverse-engineered enough of their process of moving money between them and the park and what not to convince them to refund me for the wrong (and unused) tickets. Another time an OTA with a customer service stand at a hotel in Hawaii had worked with me for 20 minutes to book tickets for an event, and then at the very end they said, "The booking fee is $250. But we'll waive that if you attend a 1-hour sales pitch!"
My strategy these days is to use an online travel agency to learn about hotels with vacancies and events in the area and then to go directly to the hotel or event web sites to purchase. If there's no way to book except through the OTA, I'm not going to have anything to do with said hotel or event.