I'm not saying this will happen to you, but i have a friend who sent off his initial "interest" form to his AFCO, and they never got back to him. So he sent off another one, and the same thing happened. (Maybe they were hinting at something - "L", if you read this sorry mate!)
He ended phoning another AFCO.
Maybe wait it out a week then give them a ring.
(You'll find there's a lot of waiting to be done throughout the process).