I did it (whimper, wiping tear from eye) . . . worse than I'd thought. I thought calling during Seattle business hours would get me an American to talk to, but it was an Indian lady who couldn't seem to understand me any better than I could understand her.
I said - problem with the forward page turn button. She says - what kind of damage is there to the screen? Did you drop your Kindle? Did you put pressure on the screen? The implication, of course, was that surely this was my fault.
No, I answered - the problem is the page turn button. So you did not drop the Kindle?, she asks again.

By then, I'm biting my tongue.
Next, she thought I was asking to exchange the K3 I bought my daughter in August even though I said I'd bought this one on October 6, last month. Finally got her to understand that I had bought two K3s recently and wanted to exchange the newer one.
She asked me for a ton of information - thought purpose of having them call was that they'd have all they needed.
Finally, she allows as how I'll receive email instructions on how to return my K3 and that I'll receive a replacement tomorrow.
I would have used the chat function, except it said on the screen that if I needed an exchange I was supposed to use the phone.
At least that part's over (for now, says the pessimist). Next, I get to check the quality of the K3 that I hopefully get tomorrow.
I hadn't planned to be home tomorrow, but didn't think about that when I called - so I guess I'll be home.
Oh well - at least I did it. I wonder if it's ever possible to talk to a native English speaker at a customer service number these days. I don't care where anyone is from, but CS personnel should speak and understand English.