I called Mason exterminating about a problem I was having with tiny black ants in my kitchen. The technician came and treated areas in my kitchen, basement and around the outside of the foundation. He explained that there would likely be a recurrence of ants in a couple of weeks, but that if/when that happened, he would come out and treat again at no additional cost. He was true to his word and just as friendly and pleasant during the second treatment as the first. The second treatment got rid of the ants for good and I was well satisfied with this company.