(2) Where the requester has previously failed to pay a fee charged in a timely fashion (
i.e., within 30 days of the date of the billing), the PBGC may require the requester to pay the full amount owed plus any applicable interest as provided in
paragraph (c) of this section (or demonstrate that he has, in fact, paid the fee) and to make an advance payment of the full amount of the estimated fee.