were they right?

The opening part of a double glazed window would not open easily-the handle seemed locked and I had to pull it over the fixed part of the window to close it, so I called in a window repair company. They said the hinges needed replacing and a new handle was needed, whilst this was being done they found that the locking mechanism on the under part of the window had broken so that also needed replacing. They also put new hinges on another window (draughty)and said these would stop the draughts as the new hinges would pull the windows in-faulty hinges were the most common problem producing draughts. For this they charged £55 per set of hinges,£15 for the handle and £45 for the locking mechanism +vat a total if almost £200!! Were they right or have I been diddled? HELP please as my husband is very angry and convinced we've been done.