Ehlanzeni College Payment Delay

On behalf of my company Akalali Productions pty Ltd, we have provided a service for ehlanzeni Tvet college by supplying 200x cases of 500ml bottled water to the institution, we made delivery on 10/04/2024, we were told payment would take 30 days but till this day there has been no payment from the institution. We have been sending enquiries regarding this but there has been no clear response or any update, it has been more than 40 days since delivery