Who fitted it ?
If you can get a industry leader in body glass (Autoglass etc) to confirm the refit was sub standard then you have grounds for a claim. If it was Autoglass who did it, don't say anything until they have inspected it.
They should be able to tell if the correct procedure was adhered to.
I used to work for the RAC doing glass, so skipping all the pre removal/install check bits. Once the glass is out and the bond has been cut back, if there are any areas where bare metal shows it MUST be etch primed, then primed with the pre bond primer. Skipping either of those and you neck was on the line. If they didn't prime correctly it will rust and the bond fails. If there was an issue after you did the work and it was proven you didn't follow the process you were liable for damages if it went to court. Most are settled before it gets there (I never had one btw)
I'd say it's certainly worth looking into if it saves you the best part of £2000 in repairs.