(a) Method. Payment of penalties by the respondent is to be made by bank cashier's check or other instrument acceptable to the Commission.

(b) All checks or other instruments submitted in payment of claims shall be made payable to the Federal Maritime Commission.

(c) Default in payment. Where a respondent fails or refuses to pay a penalty properly assessed under § 502.603, or compromised and agreed to under § 502.604, appropriate collection efforts will be made by the Commission, including, but not limited to referral to the Department of Justice for collection. Where such defaulting respondent is a licensed freight forwarder, such default also may be grounds for revocation or suspension of the respondent's license, after notice and opportunity for hearing, unless such notice and hearing have been waived by the respondent in writing. [Rule 605.]