Armed Force Pest Control

They came out and had me sign a contract for getting my attic rid of mice, cleaning and disinfecting it, and placing screens to prevent the rodents from coming in. All they did was spray a foam around some vents and leave within an hour. For this they charged me over $1000. They in no way fulfilled their contract and now they're harassing me for the full amount. I've offered to settle for the time they spent there but instead they're threatening to put a lien on my home. I'm eighty years old.