We got HELOC without visual appraisal ,$0 closing costs .

Depends on how much sheetrock repair and touch up they had to do....not enough detail on what was actually done.You may have been screwed out of a couple of hundred bucks at most.... price doesn't seem too off to me for what I would visualize in my mind as being done.Best you can do is next time get better info on what the actual issue is.....condition of the actual damage...... get pix before, during and after...more detailed invoice.I probably wouldnt sweat this one....but make the plan on how you handle repairs and quotes in the future....

Visual isn't good enough.

I will also draw up a blueprint or a 3-D visual for them.

I also have a licensed electrician that is very good helping me with visuals inspections as well when needed.

Care to share some visuals and numbers?

Some people are visual and some are audible interpreters for sellers.

I take a map and highlight the streets as I go (red = "A" neighborhood, blue = "B", etc.) just based on my visual.

If you want to figure something out when it comes to repair, it's the first place I turn to, to see if there's an visual content on what I'm trying to achieve. 

And with adequate visual dampeners such as a fence or trees, most people don't give it much thought.