They call multiple times a day, sometimes I also get calls with one number off (ending in 4507). Won't leave a message. I called back and they wouldn't tell me who they were, they said something about the core charge on my electric bill. They insisted they've been sending me notices in the mail, and wanted to change my energy rate. Very rude and pushy. I said I just wanted off their calling list because they call so much, and the person said "that's not us, that's probably other companies calling, thanks," and hung up.