CALLS CONTINUEOUSLY DAY AND EVENING TO MY CELL PHONE NUMBER, WHEN YOU CALL THE NUMBER BACK  THERE IS A RECORDING THAT SAYS "NUMBER NOT IN SERVICE".  NOW HOW CAN THAT BE WHEN THAT IS THE NUMBER RECORDED ON MY CELL PHONE. I PUT MY CELL NUMBER ON THE "DO NOT CALL LIST"  MONTHS AGO BUT  STILL GET ANNOYING PHONE CALLS LIKE THIS. WHAT DOES ONE HAVE TO DO TO STOP THOSE CALLS?