Otel.com (also trading as dhr.com or hotelspro.com). When I was looking for a hotel in Thailand this organisation advertised rooms available. On making my booking and entering credit card details, the site immediately responded that unfortunately rooms were not available and credit card would be refunded in due course.
On following up with the company I was advised that refund would take 20 to 25 days because of international banking processes. I complained that this was unreasonable and asked for evidence that the refund had been initiated. No response and no refund yet (25 days later).
Furthermore site is still advertising rooms available.