Seat change

Hi
This is many a tired old topic however, I requested my seats online for my party of four travelling home LAX to Heathrow two rows of two. Checking today my family have been moved to the middle three and me in the adjacent aisle seat which means I'll be sitting beside a stranger instead of a member of my family. How do I get my original seat request? Virgin sympathise but say there's nothing they can do.
This is many a tired old topic however, I requested my seats online for my party of four travelling home LAX to Heathrow two rows of two. Checking today my family have been moved to the middle three and me in the adjacent aisle seat which means I'll be sitting beside a stranger instead of a member of my family. How do I get my original seat request? Virgin sympathise but say there's nothing they can do.