I once ordered two knives from a website that I think went out of business.
I don't remember the name of the site.
Anyways, they sent me the wrong two knives.
I got the runaround with customer service, but got a full refund through PayPal.
I don't think I threw a big fit about it. 
These things happen from time to time, though I don't usually get the runaround from customer service.
Usually I just state the facts, maybe take some photos, and they resolve the situation without me having to get PayPal or my credit card company involved.