(1) Submissions of deposit receipts to ECTEL shall be supported by—
(a) the invoices quoting the serial numbers of the receipts issued by the responsible officer under regulation 7;
(b) the used receipt books from which the receipts were issued; or
(c) duplicate copies of receipts issued; or
(d) a certified statement of a computer printout showing details of all receipts issued.
(2) Deposit receipts shall be submitted to the Managing Director of ECTEL not later than the seventh day of the month following the month of the deposit of the frequency fees.