CLIENT REFUSING TO PAY EVEN AFTER DELIVERY

This was one of my trusted cash clients, always made payments as soon as material were to be delivered. Client made wrong order,insisted that he had made the right order and I had just gotten wrong. I had accepted my fault and told him on Whatsapp that I will make a plan to send the other items over the weekend. He blocked me off whatsapp,totally ignoring the companies calls. I sent my driver around to his place to collect money(been waiting 2 weeks by that time) Now he still refuses to pay after promising me on Friday again that payment will be made. This is over R2000 and it WILL be deducted from my salary seeing as it is already an old-month sale and my headoffice is on my case wanting the money immediately and I cannot supply that kind of money out of my pocket. If this money gets deducted from my Salary next month I will not have money to pay my house or food. This guy is disrespectfull and will never ever be helped by my company again. Aswell as possibly ruining my home contract by the end of the month if he has not made payment. I cannot afford to be blacklisted thanks to someone who cannot pay his own debt.