The Department of Consumer Affairs shall maintain a file for each creditor containing the original and all revised rate schedules filed by the creditor. A certified copy of each filing showing the date and time that it was received shall be sent to the creditor making the filing at the time of its receipt. A fee of ten dollars for each rate schedule filed by a creditor shall be payable to the Department of Consumer Affairs for its services in maintaining the rate schedule files and providing one certified copy of each rate filing to the creditor. Provided, that each creditor shall be required to pay a minimum annual fee of ten dollars. Additional certified copies of a filing shall be provided at a charge of four dollars per copy.