You normally have consumer rights to a repair, replacement or refund when goods are faulty, depending on how long you have had them and the circumstances. A refund is generally money returned to you rather than earnings, but if it increases your savings or other capital, it could affect Universal Credit under the capital rules: savings below £6,000 are usually ignored, while £16,000 or more normally means you cannot receive UC. Report any relevant change through your UC account and check the latest guidance on GOV.UK, as the treatment can depend on your circumstances.