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Changing one bed villa to villa with multiple bedrooms

Hi, can someone help with my issue here?

We've made up the ad of our villa in a way that it says that it is a one-bed villa now, while actually we have 5.

When i want to change it, the page says it is impossible and we have to wait until the last client has been checked in. But i already hace clients for next year and it will keep on going that way so how do i change it without have to take offline my ad?