Lekkerslaap not lekker at all!!!

I am a host with my property listed on lekker slaap. A guest book my property while my cancelation policy was set on strict. According to Lekkerslaap my deposit requirements were set for 50% which I do not agreer with but let's say it was the case to give them the benefit. The guest actually still payed the full amount. Then the day before they checked in I got an email at 19:02 that evening from Lekkerslaap asking me if they can cancel one night. I did not agree as this was over a long weekend and they asked this the night before they checked in. Lekker slaap then told me that with my strict cancelation policy I will still loose 50% of the fee for the one night which according to me was not in line with the strict cancelation policy. The lady then told me although the cancelation policy stated you get the whole amount back this was only applicable to the deposit. This does not make sense as it states everywhere that even with the friendliest and most flexible cancelation policy on Lekkerslaap you will loose all you money if you cancel less than 24 hours before checking in. It is obvious that somebody at Lekkerslaap made a mistake and now they want me to pay for it.