If you look at their website
http://www.pooters.net/, it states they are a family owned and operated business named with their child's nickname.
I also see on their website they accept MC and Visa. If the homeowners in question used a credit card as their method of payment they may have some recourse through the credit card company.
It's too bad this happened but it's ultimately the homeowner's responsibility to make sure anything done to the outside of their home complies with all the covanents and restrictions they agreed to abide by when they purchased the home. Unfortunately there are too many homeowners who don't have a clue as to what is in their deed restrictions or think it doesn't apply to them.
Also, if the installation job was as bad as has been stated, why did they pay for it?