(1) The payment of some or all of a toll charged in respect of a classified vehicle in accordance with the regulations or for which an invoice was issued under this Part and related fees and interest does not prejudice the right of the person who received the invoice to dispute or appeal the liability for, or an alleged failure to pay, the toll, fees and interest referred to in the invoice.
(2) If an amount is paid in relation to a toll charged in respect of a classified vehicle in accordance with the regulations or a person's account or payment mechanism is debited or charged under section 17 in relation to a toll,
(a) the owner of the classified vehicle or the person whose account or payment mechanism is debited is, for the purposes of sections 20 and 21 and subsection (1) of this section, deemed to have received an invoice in relation to the amount paid or deducted, and
(b) the concessionaire must, on the request of that owner or person, issue to that owner or person an invoice, marked as paid, for the amount paid or deducted.
(3) Section 18 applies to an invoice issued under subsection (2) (b) of this section.