Missed call hang up on answering maching.....

I have gotten this call from:(519) 660-6672; (519) 660-8316; and (519) 660-8352.  They will never leave a message.  When I call back it will not allow me to speak with anyone and states the voicemail is full.  It's a scam.  I called my cell phone company (Alltel) they stated cell phone companies cannot block the numbers from calling me and stated I should go to my local police or sherrif's office to file a complaint as I am on the Do Not Call List.

Repeatedly calls my cell phone, costing me time and money. When I try to call the number back it goes directly to voicemail.

who is this number

Received a call on business cell phone,indicating they were with mastercard, and due to being a good customer would be receiving a diamond watch, and wanting to sell magazine subscriptions for the price of 3.00/month to cover postage.  Seemed fishy upon learning of this, called the number back, answering machine with a young mans voice stating that this is "PSI" leave name and number... they knew our mailing address etc, might have to alert the authorities The person identified himself as Joe.

they just called me today lol..they said something about 50 bucks to 1000 bucks, them they asked me do i hav Visa or master card or something. Then i said no and they just said bye to me :)..... so wats that PSI or TSI about ?? defraud ? is that how u say it lol.....