I know that even the best company can have a bad customer service person answering the phones from time to time. This is what I do.
- I check to see if the person has opened a support ticket and get the ticket number.
- I ask to speak with a supervisor-or-
- I call back
My preference is to use on-line support, by email, or on the website. That gives me a ticket number and a history as my problem is dealt with--no chance of the call centre person complaining that I was rude or at fault in some other way--what happened is there in black and white if I need to go further.
For Kobo, since I am in Canada, and my Chapters-Indigo store is absolutely great, I would take my reader there if it needed to be replaced with the expectation that I would walk out with a new one. That is why I buy from the store, rather than on-line.