My IICRC technician pretended to be a licensed contractor. He is not. He completed $40,000 of work by working himself and hiring others to perform (only $12,000 was demo/mitigation work for water damage). I owe $7000. The work is a disaster and was completed without permits. There is also property damage and he will not return my keys until paid in full. Is he entitled to the remaining $7,000?