Perfect Power Wash review: I have let this company know that I am not interested in their product

My husband is retired, a veteran, and disabled. He had to quit his job and retire. I am continually harassed by this company, through phone calls, emails, text messages, and USPS. I have told them I am no longer interested in their service and to quit harassing me. I am under a tremendous amount of stress caring for my disable husband, and I don't need this company's harassment. I don't want or need their service. Isn't there a law to prevent companies like this to continually harass senior and elderly people?