Hi,
The original problem of the door not latching would have been an issue with the strip or the door being misaligned with the central keep and nothing to do with the cylinder. When carrying out the inspection to provide you with the quote a problem like this should have been easy to diagnose correctly and quickly. If there is a problem with the strip a replacement would generally range between £60.00-£120.00 and depending on the make and model a replacement gear box (the central unit operated by the cylinder and handle) can be replaced instead for a general cost of £30.00-£60.00 plus the labour charge which should have been given to you clearly in the quote. If the strip is obsolete which can often be the case with older Upvc doors then an alternative can usually be sourced within the above price range. There would normally be some alteration required to the door and frame which is not too big a job but I would not personally trust the knowledge and capabilities of someone who believes replacing the cylinder would resolve the issue of a multi-point door not latching. It’s also worth mentioning that having a multi-point door secured purely on the latch is a bit of a lapse in security as the latch is very easy to manipulate from outside or through your letterbox so you should always lift the handle and lock the mechanism. Security is just as important if not more so when you and your family are home as being present when an intruder enters your property can be a far more distressing and dangerous situation. Really the job should have been established and priced correctly during the inspection, failing that the locksmith should not have fitted the handle or letterbox as this was additional work to the actual job required and instead should have called you to inform you of the situation once they realised they could not resolve the issue in the manner they intended and offer you a new quote giving you an option to decline.

Sorry to say you have been ripped off, but the door will work fine, you just need some one who knows what they are doing. I can get any lock mech, I'm an independent service engineer, and I use a lock library.

Hi there, a mechanism for a upvc start at about £30 To £ 60, with labour on top of that it would end up being about £120.I always explain my charges over the phone so there's no confusion, when the job is complete. Sounds like he was a bit of a cowboy.

There was no need to replace the lock at all, a slight adjustment of the central keep or the door itself would of most likely solved your problem, it sounds to me he was trying to con money out of you for work that didn’t need doing but like the answer above says, you should always engage your locking mechanism and lock it off as it’s very easy to gain access quickly and quietly otherwise.

Sounds like a terrible experience you've had. Like the replies above it sounds like an adjustment of the door keeps could have solved your problem. The prices you have been given are grossly inflated .
These experiences give the industry a bad reputation.

I can't offer any more advice than what has been given. The advice above hits the nail on the head.
It's more shocking that there are people in the industry that still take advantage of people in stressful situations. Before any work was done, the engineer should have contacted you before hand not just do it then say "hey here's my bill". Scandalous that!

Most of time PVC door locks mul t point locks need adjusting the alignment to the frame lock keeper .

By your description there is nothing wrong with your multipoint mechanism and there was no need to replace your cylinder at all. The only problem being that your latch is misaligned with it's keep, this is usually a simple adjustment that takes little time to do.