My limited experience with Kahr CS and my PM9 has been just the opposite of the OP.
The couple of times that I had to contact Kahr, they were extremely helpful. The one time that the pistol had to go back, at their request, they picked up the tab both ways.
I've had two mags replaced, no questions.
I broke a mag follower, they sent a replacement along with two spares!
I reported a minor problem/malfunction with a recoil assembly, I received two.
Maybe it's just the way in which you approach them?

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JimC