I do have their agreement and quote in writing, thank God, but the developers do not seem to worry about this until I mention legal proceedings, and then they do a bit more work.

Today, I sent through a list of things I was not happy with. This I was asked to do by the director of their company. Their programmer blew a fuse, was very nasty to me and complained that I was giving him extra work and thus I was delaying the completion of the site.