The operator did air-duct cleaning for my home, and also did removal of mold as he claimed there might be a big problem if I did not do it. I trusted him and did not monitor his work. After that, I paid him with cash, and over paid him for $10 because he did not have change. He said his boss would send the warranty and the change to me by mail. Then I have to wait for more than one month to receive nothing. I called him many times for the warranty (I already gave up the effort to collect the change). He even gave me a wrong address, where... read full review »