Wrong part but they withhold funds?

I got the wrong cylinder head even though I was assured by the phone person after she did some checking that it was in fact the head for the right cylinder bank. Well, it wasn't and I didn't have time to waste on waiting another two weeks for slow shipping. So I bought the correct cylinder head from another source and had it overnighted. Now upon returning the item, I found that they withheld 10%. What kind of crappy customer service is that?

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