It's an issue in the customer service sense. Their response to a customer seeking another avenue of resolution wasn't to try harder... it was to threaten them. That's ridiculous.
Impatient? Just exactly how patient should one be with a retailer who acts like they've done you a favor by allowing you to return a product that completely fails to function and then sits on it with no response for a number of days?
We're now a full week from the date of receipt with no communication, no apology, no refund, no credit... They've had $125 of my money for nearly a month and all I've gotten from them is an excuse, a threat and a shipping label.
Maybe I was a little quick on the trigger, but that's proving to just be a preemptive strike.
Why not take a deep breathe and call back? Be as nice as humanly possible, and ask what the status is? You get more with honey than you do with vinegar.