Under the Consumer Rights Act 2015, goods must be of satisfactory quality, fit for purpose and as described. If you report a fault within 30 days of receiving the goods, you can usually use your short-term right to reject them and ask the retailer for a full refund. After 30 days, you will normally need to give the retailer an opportunity to repair or replace the item before seeking a refund, although specific rules and exceptions apply. Contact the retailer first and keep your receipt and evidence of the fault; check GOV.UK or speak to a solicitor regulated by the SRA if the dispute continues.