Tribute 736 new 2017 model

I was wondering if anyone could give me some advise or point me in the right direction . We purchased a 2017 Tribute 736 in Nov. 2017, brand new from Chelston Motorhomes.

It has already been back previously for the whole side panel renewing due to water ingress, and then while we was away the solar wasn't working , had to get electrician out , it was wired wrong. and last week the floor near the door has gone spongy ( delamination ). I called them to get it fixed under warranty, to be advised you haven't had your habitation inspection done so your warranty is void! I explained to the lady I have no idea what that this, what is it she said you have to have it done every 12 months with them, I said I wasn't aware of that as if I was I would have ensured it was done especially after the issues we have had, she just replied with sorry it isn't covered... I am so angary and annoyed about this , surly this can not be the case , the floor should have lasted longer than a year and a half … if anyone can advise that would be appreciated.