In Cardiff, as in the rest of the UK, if you've purchased faulty goods, you are protected under the Consumer Rights Act. You have the right to request a refund, repair, or replacement within 30 days of purchase if the item is defective. After this period, you may still be entitled to a repair or replacement for up to six months. It’s best to contact the retailer directly, and if they refuse to help, you can escalate the issue to the relevant consumer protection agency. For specific guidance, consider checking with a solicitor or visiting the official gov.uk page on consumer rights.