The advisor of this company measured the surface o...

The advisor of this company measured the surface of the walls (for cavity wall insulation) 11 m2 more which 12% more than reality. Moreover, the advisor said there is no insulation in the walls even if he checked it with a camera. He was saying I think there is dust on the lens so I see something white but not an insulation. I think they have almost no idea what they are doing. In reality, we have an old insulation between the walls (another 2 experts from different companies confirmed) and ignoring this fact changes which material needs to be used completely. Very unprofessional. Moreover, the quote we got from this company was way more than the other 2 companies that I got an offer.