Hangup calls to both home phone and business line. Both lines are on Do Not Call list.

This is a nuisance company that dials numbers using computers, to see what numbers answer. This is illegal use of telephones.
Then they sell the numbers to telemarketers.
It would be good to find out who these folk are.

The number calls repeatedly and hangs up as soon as you answer the phone. It is so frustrating to have to put a customer on hold to answer another ringing line just to have to deal with a hang up call.