What part are you disputing?
I disputing the $120 for zippers. When I ordered it with Connie's daughter she told me the suit had zippers included for that price. I was told there would be an extra charge for me being fat and I said that was ok. The $50 custom charge for a custom wetsuit is kind of shady. I probably needed a spine pad but didn't ask for one. I'm sure if she asked I would have said that was fine. So getting hit with $200 extra without talking to me is a bit much.
I deal with estimating millions of dollars, in a service industry, and I deal with contracts with work scope and exclusions on a daily basis.
I'm working on getting a quote for a custom 7mil right now. The first company I reached out to gave me a breakdown, of everything that is on the final invoice I posted, without me even asking.