If you have back rent, take the person to court and get a judgement and garnishment of wages. 

A good painter can Spray pretty good if he has the proper tip , good quality paint, and at least 100 jobs done prior to yours.So many factors involved,  are you protecting the flooring,  changing colors a lot lots of repairs done prior?

I would let them know that you have documented proof that they screwed up, and if they won't waive the fees then you will make it your personal mission in life to leave a negative review (with proof) on any website that allows reviews. 

I am in the DFW area and met them in person. 

I personally don't see an advantage in requiring it.

You will end up with bad quality and unreliable service.

(I haven't done this personally). 

Investing in New Builds: Considerations and ProcessNew Build Investment Options:Build and Sell (Fix and Flip):Pros: Potential for high profits with modern appeal.Cons: Requires significant upfront investment and market risks.Build and Hold (Long-term Rental):Pros: Attracts quality tenants, potential for higher rental income.Cons: High initial costs, market fluctuations.Process Overview:Market Research: Identify high-demand areas.Land Acquisition: Purchase suitable land.Design and Planning: Work with architects and obtain permits.Construction: Oversee build quality and manage costs.Marketing (Fix and Flip): Highlight new features to attract buyers.Tenant Management (Rental): Implement thorough screening processes.Advice:Educate Yourself: Understand local regulations and market dynamics.Risk Management: Prepare for potential delays and cost overruns.If you have any other questions/just want to discuss feel free to reach out to me directly!

Is the squatter some random person or where they living there at one point and stopped paying rent? 

It's hugely trolly, weird, and borderline sociopathic.Healthy disagreements are fine in forums, but when you initiate the conversation, you can't later hide from it and make it like someone else started it when the entire dialogue is right above.A lot of this has to do with personal fragility and internet puffery.At one point, I invited two trolls to hop on a recorded (for everyone's sake) Zoom to discuss what they were up in arms about.