Chaos in the warehouse?
First, two incorrect anodes were delivered. Okay, that can happen. Then, on the phone, I was told we only had one; the delivery of further anodes was pending. So, without being asked, they sent the one incorrect one. In the end, two arrived after all.
Otherwise, everything is fine. I sent a return label immediately, and a new invoice was issued; the amount for the two incorrect anodes will be refunded upon receipt of the returned goods by SVB.