We were hired to do 2 separate jobs from one client. I am a GC but was hired as a sub by a GC. completed the first job (still owes $3800 on that job) started second job, plans were wrong, his plumbing subs did their part wrong ( i had my men fix for free), did extra work, then we disagreed on something and he terminated the remaining work to be done on second contract. We agreed to the separation. He then requested most of the money we received from him for second job refunded. We sent a break down of costs including money owed from first completed job (we were generous as we just wanted to go on to our next project). the breakdown sent had us owing him $3500. He denied and said we owe much more now he got a lawyer and wants $38,000 immediately. What is our next step. We do not owe him $38,000 and dont want the CSLB involved.