Sorry for the delay in following up. I emailed the hotel back and they clarified by indicating the property would be fully booked and they wanted to ensure I would show up. I did not put a guarantee as I knew I'd be arriving midday. Also was under the impression there was a default credit card on my "PNR" with Accor. The hotel's reply included a form that I agreed to fill out and fax my cc details back to them. I would not normally do this but they also indicated that if I did not, they'd cancel my booking.

I did not really appreciate the attitude expressed in the correspondence, but put some of it off to local cultural attitudes and familiarity with the English language. I plan to speak with the GM or one of the Assistant Managers when I arrive on Saturday though.