If you’re 18 or over, you have the same consumer rights as any other adult under the Consumer Rights Act 2015. If the goods are faulty, not as described or unsuitable, you can usually reject them for a full refund within 30 days; after that, you may need to accept a repair or replacement first. The retailer, rather than the manufacturer, is normally responsible, so keep your receipt and contact the seller. If you’re under 18, contract rules can be more complicated, so check the guidance on GOV.UK or ask Citizens Advice.