With a heavy heart (I prefer NOT to deal with Amazon for different reasons) I have to admit that Amazon CS is outstanding.
And so Kobo's used to be. For some reason, in the last year or so, it went downhill. This is not the first time I am waiting for their reply for weeks. But it's not an urgent issue, so whatever. A few months back, tho, I was missing books from my library while I could see them in my purchase history. I did get my missing books back after about 2 months of silence and when I got them, they were DRM PDFs. True story