Grrrrr. Nobody at Lanshack is home today, it being a federal holiday, but tomorrow they better sort this out.
Update: While I was writing this, someone from Lanshack answered my email from this morning. It's a model of how to deal with an error:
We obviously made an error and sent you the wrong patch panels. I can ship you the correct (loaded) cat 5e patch panels on Tuesday (7/5) and they would arrive to you on Friday (7/9). Would this work for your schedule?
As for the return of the other panels; if I were to send you a UPS prepaid return label by email would you be able to print and attach it to the package and give it to a UPS driver?
I apologize for the error and any inconvenience that it may have caused you.
And it's even signed by a particular employee, in case I want to follow up.
Mistakes happen to anyone—and this is much better coping than you often see.