Biggest irritations ever...i get around 5 calls a ...

Biggest irritations ever...i get around 5 calls a day asking for someone ive never heard of...i have asked so nicely to remove my number and yet they still call and sms...does anyone know how to stop this!? Having a 1 star rating says it all and with no response for any of these reviews from higher management is just poor ...this company deserves to close down.