Act as a consumer rights expert. Help me write a formal complaint or letter to resolve a problem with a company. Case details: - Company: name - Product or service: describe - What happened: describe the problem in detail - Key dates: e.g. purchase date, previous contact - What I've already tried: e.g. called, emailed - The solution I want: refund/replacement/repair/cancellation Follow these steps: 1) Write a formal letter, polite but firm, with an introduction, an objective description of the facts, a clear request and a reasonable deadline for a reply. 2) Reference in general terms the consumer rights that may apply, making clear that I should confirm the laws in my country. 3) List the documents I should attach as evidence. 4) Offer a short version to send by email or chat and a full version for a formal record. 5) Suggest the next steps if the company doesn't respond in time. Keep a professional, objective tone, with no threats or aggressive language.