I claimed the Bananas free charity pet almost 3 weeks ago through the WoW store. I already have a level 25 Bananas that I’ve had for years when TCG was still available. I put in a ticket a couple of days later and got a response that “they are aware of the issue” and to keep my eye on the bug reports.
I’ve tried all of the the things that people have said worked… logging out of WoW, logging out of Bnet, restarting, clearing cache, deleting WTF file, repairing WoW, and still no pet.