Hopefully, you used a worker who is licensed and bonded -- but it sounds as if you did not. You can sue this person in magistrate's court but, depending on how much he was paid, you may determine that is best to get an actual contractor to fix the problem and write off the shabby work as a hard lesson learned. If this person installed any locks, I would suggest that you change the locks since the person may be dishonest as well as incompetent and may have kept a duplicate key for a later visit. Much depends on how much you paid for the work.
Also, in future, pay some up front and hold th e balance until you review the work. Few reputable workmen will begrudge you that.
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If the contract was licensed, call the contractor licensing board and complain. If not small claims court.