We have had a similar problem with 2 different phone numbers in two different states. The first one was for a spa, stopped when the US Marshalls called us about them and we told them it was a residential number that we had had for several years. The second one we kept getting calls for the people who used to have the number and they were told there was no such person at this number. One of the callers called the police and we got a phone call from the police, DH thought they were calling for $$. That almost didn't go to well, but the calls stopped.