WELL MATE I HEARD THAT FIRST TIME THAT U HAVE TO SHOW CONCERN NATIONALITY TO CHANGE SPONSOR SHIP ITS VERY SIMPLE TO CHANGE SPONSOR SHIP CHANGE AS UR FRIEND IS ALREADY HOLDING A VISA SO THERE IS NO POINT TO SAY THAT IT REQUIRED ONE MORE VISA TO SHOW IMMIGRATION TO CHANGE THE SPONSOR SHIP THEY DON'T HAVE ANY PROBLEM TO CHANGE WHAT EVER THE NATIONAL IS IT. MAY THIS MANDOOB IS REALLY NEW GUY WHO REALLY DON'T KNOW HOW TO CHANGE SPONSOR SHIP OR MIGHT BE HE GET CONFUSE ABOUT UR FRIEND VISA STATUS MAY BE HE THINK THAT UR FRIEND JUST ARRIVED BACK IN NEW VISA AND STILL NOT STAMP ON PASSPORT IN THAT CASE CHANGING SPONSOR SHIP REQUIRED ONE VISA SHOULD AVAILABLE IN REPUTED EXCHANGE. I HOPE THAT WILL HELP U TO GET BACK TO THE MANDOOB AND CONVINCE TO GET PROPER INFORMATION FROM IMMIGRATION.