I had success making a complaint to the BBB on AFNI and had an old account deleted , they never answered my letter for validation either, this was even after I sent PFD letters and those also went unanswered then they up and delete after I filed with the BBB.
I have one more account with them also and I'm waiting for their answer to my second complaint to the BBB , they have until the 30th so I'll update if and when they respond.
Be patient it took about 5 months to get that first one deleted, and I was willing to pay just to get rid of them even though the OC couldn't find the account so that the basis of my complaint with the BBB
Good Luck