It's obvious that you are annoyed and just want people to agree with you, so I'm not going to respond to this any further after this. I hope you can find a satisfactory outcome for your house, and it's a good home for years to come. If it helps, remember that in the big scheme of what you're paying here, that 500 is a sneeze in the wind.
It doesn't help because I don't see why I should have to pay for this. I'm not here to ask for people to agree with me. I asked if I was right to complain. Considering your first response was to question whether the bank would even follow up with it suggests you think it's dubious too.
Why? They've just come in and assumed things. I'll go further in response to what you've posted below.
No, the nature of an assumption is that you combine the simple available evidence - a flue roughly located above the kitchen, no fireplace in the kitchen - to a reasonable conclusion: the fireplace has been removed from the kitchen. An assumption that will be right the majority of the time, because removing flues from the kitchen is a run of a mill thing that happens to houses. In this case it was wrong. That will always happen with assumptions, they'll be wrong sometimes. Your assertion is that this is negligence but that does not follow from the evidence that you've presented to us; only that they were wrong.
You're making a bunch of assumptions too.
Here's the gist of it. That chimney breast is within 4 rooms. It has 3 chimney pots, which might mean it has 3 flues, that's not definitely true but let's assume it is. 4 rooms, 3 flues, implies 3 of the 4 rooms had fireplaces in. 1 of the fireplaces is still there so that leaves 2 to account for. There is a vent in one of the bedroom photos so that was probably another one, so that leaves 1. Kitchen or other bedroom. Who knows? There's no evidence to suggest there was one in either.
So let's go over another point. Removal of a fireplace, i.e. removal of a mantle and blocking a chimney has no structural ramifications, mantles are decorative. So that's not in question here, what is in question here is a removal of a fireplace and also a partial removal of the chimey stack behind it.
So they've asserted that part of a chimney stack has been removed from the kitchen. If there was an extra part of the chimney stack in the kitchen, why would the window be where it is? Being half blocked by it? Also what evidence is there to suggest any part of the chimney stack had been removed? There isn't anyway, and they haven't provided any.
Considering you went armchair psychologist with this:
It's obvious that you are annoyed and just want people to agree with you,
I'll do the same and just say you're just being a contrarian.
However where I do agree with you is to just leave it here because frankly I'm fed up of talking about it. I'll let the thread know the outcome of my complaint.