If it were me I would see if there were some quick, small things I could do to help the Yoast score. For example, shorten some sentences, maybe switch a few words to make it "easier" to read etc. See if that gives it a positive bump in Yoast's eyes.
If that doesn't work, or they aren't willing to do that and they just want a full refund, it would depend on who they are, how much money it is, how long I spent on it. In the end, if I felt like I did the job they hired me for I would probably offer them a partial refund but if they refused I wouldn't offer any.
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