I have a external UPVC door that has been fitted incorrectly as there is a gap at the top between the door and the frame. I cannot open the door wide enough to take the door off to see if I can re-fit it because the door catches on the inside wall. I cannot get the people that fit the door back as it was fitted before I moved in and the previous owner can't remember who did it! (although it isn't even two years old yet!). So I have been left to look through the Yellow Pages to try to find someone to come and sort it out but I am not sure who would come and do it. Any recommendations?