Hilas Unique Boards partners

There is a carpenter that this company is working with by the name of Stenly Baloyi.He builds cupboards for the customers and do it in small pieces.He did a project for me that is worth just below 9000,I paid him R8700 per his demand and left with only R300.It's been 4 weeks now and the claims that the job is no longer big enough for him. He doesn't want to come finish up his job. Initially we had agreed on an amount, after getting the material cut, he wanted to change the prices with the aim to put me into the corner to pay him more. When he failed to push me, he decided to do half job and take a big junk of my money. I am failing to understand that why would this company partner with him without them knowing how he ****s their customers.