Financial department not on par

The problem we encounter is in doing work for AC Durect. We did our jobs as proffesional as posible, we did the invoices straight after. The workers are very friendly but unfortunatly very un helpfull as when it comes to payments. Payments dates keep getting moved on and all we get is they will sort the rest tomorrow. Same as last week. We actualy did morr work for them with still no payment.