I booked our 7night Christmas break in September -...

I booked our 7night Christmas break in September - so hardly last minute. Looking throught the hotel website the rooms seemed to be large, airy, with additional seating area and balcony.
On arrival we were given room 607 - what a nightmare. The room was tiny, airless and dark. There were no windows (just 2 skylights- which when we first opened them resulted in us getting covered in snow), there was no balcony, and just one dining room style chair between the two of us.
Each morning my partner (who luckily is nearly 6ft) had to clear the snow off the top of the skylights so we could have a bit of fresh air as the room was stifling. I had no chance of seeing the view being only 5 ft! The radiators which only seemed to come on in the night were realy noisy as was the plumbing.
We asked on our first day (24 Dec) if there was chance of a room change but was told this was not posisble but they would let us know should one become available. On 26th when it appeared people were leavng we again asked and again was told no but they would let us know, there were several times over the week when guests came/went but at no time were we offered the promised change.