I own the painting company (Imperial Painting). We are doing a commercial job. It's a weather forecast station (exterior). I hired a sub contractor to do the job. He was supposed to pressure wash, Scrape all loose paint, and paint. Well he told me he didn't pressure wash and there's old lifting paint all over the building. There's also concrete blocks that had been falling apart, that had a loose layer of paint holding back the loose block material. Instead of scraping it off he painted over it. I'm told him today he's responsible to fix the mistakes and he said no he's not going to fix it. I haven't paid him anything yet. I told him I'll pay him In full when the job is completed and the customer is happy. He said no. He said he's going to place a lien on the property. If he's in the wrong how do I protect me and my customer? I have video and pictures of everything the day me and the sub walked around the job.