[old link~tb]
This link may be informative. It's to a practically endless discussion (hence the thread name, I suppose) regarding those with existing accounts and their efforts to add rakeback.
There is only one person in that entire thread who cannot get RB.
FT say his account is linked to an affilliate.
He dosent believe them.
Everyone else did get RB in the end, it just takes a few weeks.
If you are linked to an affiliate you cant get it. End of story. Accept it. Move on with your life. Back away form the abusive emails etc etc.
If you are not linked to an affiliate they will let you switch but not instantly, you have to wait a bit.