Being fair-Never again Castle Photo Ltd

Just to be totally fair to the jerk that is running the print shop, I took two photo files in for printing. One of which had won me a third place out of 600+ entries. Now they had done these for me 6 months ago with no problems.
Now he says my files are not going to come out as I see them on the monitor. He claims the photo never is going to come out as he sees it on his monitor.
Dialog with owner.
Question: What color profile are you using?
Answer: I’ve got it set for infinite color.
Question: Are you using CMYK, RGB, or sRGB?
Answer: That doesn’t matter, I use infinite color.
Question: Why are the photos coming out so dark, with such muddy colors?
Answer: Your post processing is at fault.
Question: Why then did the prints come out perfect 6 months ago?
Answer: The files must have been corrupted since then.
He was then shown 6 prints he did 6 months ago for a contest.
He was asked why these were just fine, considering they were done on the same computer, software and monitor.
Answer: I have no idea how those were done.

Then he decided to jabber with no idea of what the hell he is talking about.

I don’t know what you want.
We’re not used to doing fine art prints.
I don’t know what to do for the prints.
We’ll try upping the saturation, and darkening them a little to bring out the colors.
Pictures that are lightened too much lose color.

Yet they are the ones saying my photos are too dark to start with.

To be honest.
This guy couldn’t pour pee out of a boot, if it had directions on the heel.
I doubt he’d know a good print, even if it bit him in the ass.
I’m totally done with the low grade moron. Guess it’s time to start raising cash for a top line photo printer for home.
So his claim to fame is that he knows how to destroy a business in less than a year