Family accommodation not entertained

I was trying to make a booking for my family 5 adults two kids (8 and 13 years old) it was giving me an option of family chalet of which we want dinner bed an breakfast, it was given me an option if a 6 six sleeper chalet plus one extra room to accommodate an eight year old.

I enquire with head office about this and ask for advice of what I should do since we can't have an one person sleeping in an extra room, I was told to book for 6 people then disclose that there is an 8 year old that is coming and will be on our chalet then send an email. Well online booking never worked so I had to call the office

I spoke to Charlene the manager, she told me that I must book an extra room to accommodate an eight year old, she never even take into account that all we want is to stay together as a family.

I am not running away from paying for that child but we cannot have an outside room for an eight year old, we want to stay together in one home as a family. She didn't even entertain my explanation she just said we need an extra room, said she is confirming with her dm which I am pretty sure she never because I was in hold for maybe 30seconds, there's no way she explained all this in 30seconds