Invoice request for closed period
A company has been paying me weekly payments for my services (as a commission bonus they calculate). I've been processing payments as a GST deposit and have never issued an invoice as they never requested one as they were doing the payment calculations their end. I've now closed off FY2018 and paid the GST and they have sent a demand requesting I issue tax invoices for all payments they made to me last year. In replied that I've closed my books and can't issue tax invoices against payments received, processed and closed. What's the solution?