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 personally don't see an advantage in requiring it.

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

(I haven't done this personally). 

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.

@Roberto Falckwill you travel there in person to supervise acquisition and rehab? 

You are looking to see if they are maintaining the home like a normal person or if they are abusing or neglecting the rental.

I've personally seen concessions up to 8 weeks free plus a 6 hours of free moving as an example for what some apartments are offering as concessions to fill up their communities.As the market continues to evolve and more apartment communities become available I suspect there will be more concessions for renters to take advtange of as supply begins to outpace demand.

Then have the service person come and fix it while you have it.