Custom Edge Carpentry Inc

This morning two guys showed up at our home said they they are from Custom Edge Carpentry contracted for the home builder came to complete the unfinished steps and the railings for the existing deck at the back
after a hour or so they have gone I noticed the railings of the stairs were not completed as they were not connected to the main posts when touch railings are shaking not safe and hazardous I phoned Custom Edge Carpentry many times but no one answered my call. I wonder why these people don't do the job properly and not follow the industry standards? This deck value over $8000 as per the builder's rep.