It's okay with me that an AH missed the flaw and left it out of the description. It could have been an oversight. Happens to me all the time.
But, if a customer points out that something is not right, the seller or AH should make it right and own up to their mistake.
I was not looking for a handout. Just wanted them to make it right.
Since they didn't, it's up to me to move on.
Sorry for all of the venting but I feel better now.