Keeps calling and hangs on line, then hangs up.  This is getting annoying!!!!

keeps calling and hanging up

Sales call for insurance, telemarketing

Who is this???

Keeps calling and hanging up. Sometimes 2 weeks apart and sometimes every day for 3-4 days.  This has been going on for 6 weeks. I have tried to call back & the message is, "Your call cannot be completed as dialed.  Please hang up and check the number". Suuure!