It's not just you. A friend bought a new (not sure what kind) camper/trailer last spring. There was more wrong with it than right with it, and it wasn't even the same interior he picked!! I lost track of how many times he brought it back or they came to him to "fix" it. I think it's finally OK but man, he had so much trouble with it.
I don't envy your situation and I hope it turns out best as possible ..

But, you can't blame them for not wanting to leave their home. It's just a bad deal and I hope it all works out for the best.
even more confusing / slightly annoying is when they then give you the £8 but a pound of it is still in 10/20ps etc 