After digging through link after link of Kobo's useless "help" pages, the best I could come up with is the same thing PeterT, above, found:
https://help.kobo.com/hc/en-us/requests/new
That page just gives links to their Chat, phone numbers and social media links. So, assuming it even works, I'd suggest starting with Chat.
EDIT: I had to turn off all kinds of privacy stuff in my browser to get their Chat window to come up.