Poor quality workmanship

I just had my roof installed less than six months ago this year and already my roof is leaking in a lot of places and damaging my ceiling and walls. I am disgusted by the services as I am currently having to watch my ceiling and walls get damaged on a newly built house. I have called this company to help with no luck. It was a struggle to get Brian and his guys to get my roof completed and now I am struggling to get them to come back and fix their mess!