HOW DO I STOP HARING PHONE CALLS FROM CREDITORS?

MY HUSBAND AND I JUST MET WITH A DEBT COUNSELOR TO CONSOLIDATE OUR DEBTS INTO ONE LOW MONTHLY PAYMENT. WE WROTE A LETTER TO CAPITAL ONE TELLING THEM TO STOP CALLING US AND THEY CONTINUE TO DO IT. HOW CAN WE GET THEM TO STOP? WE WANT TO PAY THESE DEBTS BUT WE CANT AFFORD TO ALL AT ONCE THAT'S WHY WE SEEK THE HELP OF A DEBT COUNSELOR INSTEAD OF FILING BANKRUPTCY.