first of all did a company fit these doors,if so they should have a 10 year guarentee and the problem is thers to sort out,secondly its a tricky job to sort french doors that are catching and not a job for novice,as problem could be many things,it could be door frame not fitted square,doors need toe and healin or hinges need taking off and moving or need adjusting.Have you rang any double glazing repair engineers in your area? because all don't charge a fortune,I would charge around £60 -80 to sort problem and you get a years guarentee which I think is reasonable as one day you might not be able to lock them and then the security of your home is at risk,so before you tar us all with the same brush ring around and get a few prices then judge us all again.
shaun www.sdwupvcrepair.co.uk, July 2008