Very let down by this company. Doors were late due...

Very let down by this company. Doors were late due to manufacturing issues then eventually cobbled together from various different profiles in an attempt to make up lost time. Mechanism has never worked smoothly or locked properly and rather than sending someone out as per my request to make simple but necessary adjustments they blame the entire mess on the installer. I have had a new fitter look at them who has confirmed that majority of errors are due to manufacturing not installation. Still company don't want to know.