One of the mail delivery dvd companies continues to call every 2-3 weeks even after they agreed to call only once per year. A real pain. The use some sort of phone system that allows them to appear as calling from various parts of the country.

Feature Films For Families calls several times a day, every day.  First thing in the morning, last thing at night.  They never give up, even when you tell them to take you off the list.  They just ignore you, and keep pestering you. They change their name to like Brian FFFF or MorkandMindy FFFF, and use different numbers. I must have a dozen different numbers and names from the same company that I have tried to block.  I haven't answered their calls in years, but they still waste their time calling.