We changed our number this past summer and have had the same problem. What I do is answer all the calls. If they're automated and leave a call back number, I call it back, tell them they cannot reach "Andrea" at that number and they take our number off the list. If it is automated but you can press "0" or something to speak to someone, I do that. We got about 20 calls a day for awhile and now it's down to MAYBE one a month. It sucks and it's a pain in the butt, but it does cut down the calls and you don't have to go through the pain of changing your number and risking having the same thing happen with that one.