Davison Siding & Windows

Have used Davison siding over the last 4 years and was happy till recently when a job they were supposed to complete wasn't. talked to Rob several times and he said he would personally get it finished...hasn't Now he doesn't answer calls or return. Quality of workmanship has changed the last year also. On two jobs that he did siding fell off within two weeks. He did come back and fix those I don't believe that should happen. Recently during the rains There was water penetration into the property because some channel was not installed properly and contractor no where to be found