I know this is not exactly the same thing, but I have had several dealings with Adorama and I have been very pleased with their service.
I bought a battery grip for my 40D (used) and it said it would be shipped with the 'AA' battery magazine. Well when it showed up, the magazine was not included. Now, I would never use the magazine, BUT I did buy it, so I emailed them and explained what happened.
After a couple of days I got an email from Adorama saying that they would investigate the matter. After a bit, they sent me an email saying that I would get the magazine in the mail along with an apology.
I would give them the benefit of the doubt. I believe that they are people of honor and will do their best to make it right...
I had a nearly identical experience with Adorama, almost a year ago (12/10/2012). I purchased a used BG-E4 grip for my Canon 5D, and it also arrived without the AA magazine. I didn't plan on using the magazine, either, but I thought it might be helpful to have it, in case I sold the grip later.
I contacted Adorama, and they sent me a new AA magazine; the "good" version with the gold contacts, not the earlier version with silver contacts that had received some bad press from users.
While I was waiting for Adorama to resolve this issue, it occurred to me that I might have to send the grip back for a refund, so I went looking for another used BG-E4. I found one on eBay from a private seller, who was not only including the AA magazine, but also 3 BP-11 batteries, all at a lower price than I had paid to Adorama. So I bought that, and when I received the AA magazine from Adorama, I put that grip up for sale, and sold it for more than I paid Adorama for it.
Anyway, back to the original thread topic, my experience with Adorama of late is that they make good on their mistakes, and the OP should not expect them to deliver a much more expensive lens, when the model was clearly stated in the ad, just because of a blunder in the accompanying photo.