You did everything right. You gave him a guarantee of 30 days. I might have missed something but the snake was in good health with Phong Ly and you.
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In my opinion, it's the buyers fault the snake had issues. If he wanted a refund, he should have asked for it within the time frame and sent the boa back.
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I'd tell him politely too kiss off, but without actually telling him that.
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I understand your predicament though. You certainly don't want any bad feedback coming from him to hurt your rep.
