Landmark Telese calls daily, leaves no message, and when answered hangs up. I am on the national do not call list, and have reported them. Suggest you do the same.
Also suggest since the government is seeking new revenue that they impose a fine on the telephone companies that participate in selling phone service to telemarketers that are chronic offenders. The simple enforcement is when a set number of complaints are registered against a phone number, the phone company is notified that the number needs to be disconnected and no further business done with the telemarketing company. Disregard of that warning goes to substantial fines, which get progressively higher as the offenses continue.