The closest term I can find is "return order", but I feel that it's very similar with "repeat order", so I'm afraid it has a double meaning.
Learn English – What’s the (business) term in English for an action where a customer returning product to seller because they are not satisfied
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Best Answer
"Return" is the correct word. "Return" is a verb. We say, "The customer returned the product". We DO NOT call it "a return order". You can call it "a returned item" or "a returned product", or simply "a return".
Yes, a "repeat order" is ordering the same thing again, ordering something you had previously ordered again. There is no ambiguity with "return". We do NOT say "a return order" to mean ordering the same thing again. I suppose you could say, "The customer returned to the store and bought the same item again", but it would be "returned to the store [or, our web site] and made a repeat order", NOT "made a return order".