"Everything was good"

"We stayed at Future Inn Bristol with our two young children and unfortunately our experience ended very badly. After check out, the hotel charged us £109, claiming there was a urine stain in the room. We completely dispute this. Both of our children wear nappies overnight, we were extremely careful throughout our stay, I checked the room before we left. Despite asking, the hotel has provided no photographs or evidence to justify this charge. What makes this worse is that the room was not up...