calls 4x a day, no one on other end. Busy signal on return Very Annoying

Called while out, no message. WTF? I have unwanted telemarketers blocked. What could these people want?

Got this call just now. no known number.. I did not answer it. they did not leave a message.

sounds like some scammers to me, he asks if im Mr MFB, curious i say yea... he says hes from CBC Canadian Blind Corporation or something... i ask yea and how did you get this number, i hear another kid in the background yell or scream... i ask again how he got the number, he goes silent and i call him a little b***h and he hangs up the phone

They are not giving up.. They tried again just now..  no message left. annoying