Tema: Ecoforest Cordoba problems. (English please)

We changed our woodburner for an Ecoforest Cordoba, this was not so cheap, 2500€ and including installation 4200€. It has about 3500 hours on it.
The insert went in where the woodburner was before, the exhaust pipe only goes up about 1,5 meters into the chimney, and there used to be a plate sealing the chimney just behind the pellet oven but that was destroyed when they came to clean the stove a year ago.
We feel it has never worked the way it should, shortly after installation we complained about the noise and a technician from Ecoforest came and he changed the fans but it still makes a bit of noise. I realize two fans are not going to be quiet but a friend of mine has a pellets oven from Leroy Merlin, a free standing unit, and it hadly makes any noise and it spits out an incredible amount of heat. It costed 600€!
We never had the heat from the Cordoba we expected, this is a 12kw unit and has a rating for up to 110 square meters I believe.
Last night it was 16,6 degrees in the living room, I turned it on, temperature setting, level 9, after four hours it was 18,5 degrees in the room, we are just not getting any heat!
I can take some pictures of the values in the display if you want, convector is normally at 55-60 for instance, I dont know what NTC is, maybe it is a temperature reading of something and gas is maybe at 230. I tried to access the service menu but I dont have the password for it.
Behind and above the pellet burner, inside the chimney it gets very very hot!
I had the dealer come and take a look but he is not much help, all he suggested is to route the exhaust all the way up to the top of the chimney because we cannot use any setting under 9, full power. If for instance we have the temperature setting on and the oven reach the set temperature, the flame slows down and it goes down to maybe setting 3 or 4 we get a smell in the room which is not pleasant!
I am not sure what to do here but it feels like a lot of wasted money as it is now. My neighbor has the same oven and he is very happy with it!
Some values when its on:
Convector 65, NTC 56, State 7, level 9, gas 265, depression 55, exhaust 37,2, pilse on 4, pulse off 5.
Any suggestions?

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Pictures of chimney and room. Sorry for upside down pictures.