Push for payment to confirm delivery date and then dont deliver

i ordered a server from Homewood, i had to pay a 50% deposit before they would give me any drawings of what the server would look like. then i get a call to say the unit is ready and that i must pay the other 50% before 30 August 10am to ensure delivery the following tuesday. no one informed me that the consultant we dealt with has left the company. on day of delivery i get a call to say there is a problem with the hinges. how do you ask for payment and confirm delivery on a product that is not ready?? i was told a manager will call me and no one has bothered to contact me. completely unprofessional.