Did I handle this well?

I had a buyer who wanted a week's worth of completely original recipes. This was not part of my gig so I added an extra to cover that. (Later I'm going to make it a separate gig on its own as I think it's a good idea). I also sell the rights to reproduce all of my recipes whether original or from my "stockpile" of them.

In one of the buyer's messages, I missed that they wanted to post them on their blog. I thought they only wanted to make sure that if they Googled them, they would not find other copies on the web. So I told the buyer to add the extra for originality. While working on them, I realized they wanted to post/reproduce the recipes as their own on their own blog. That is fine with me, but I have a $5 "release". (Cheap, I think!). When I brought this up, the buyer responded that it was not what was agreed upon and they would get a refund. They also said they would run them through Copyscape (as a warning about originality to me?).

Well, if you want a refund right now, there will be no delivery. Then a third message stated they thought I was trying to take advantage of them. For $5? Come on. The rights are clearly laid out in my extras.

I responded with:


Hello,

It was an oversight of mine. My apologies. I will issue you an immediate refund. My intention is not to take advantage but to fairly charge for my work with appropriate add-ons.

Thank you for your time.

Cheezees


Then I cancelled the order.


What are your opinions, if any, about how I handled this situation?
Would you have done the same?
Would you have "sucked it up"?
Talked more with the buyer?