That would vary from one jurisdiction to another, but I'm sure you can find guides best suited for your local laws. As inspiration, here's what I sent to Amazon & Samsung last year (in a formal cease & desist format):

Amazon .com .ca ULC 40 King Street W 47th Floor Toronto, Ontario M5H 3Y2

Samsung Electronics Canada Inc. 2050 Derry Road West Mississauga, Ontario L5N 0B9

Montreal, April 26, 2024

WITHOUT PREJUDICE

Dear Madam or Sir,

I purchased a Samsung 980 PRO SSD 2TB drive (model MZ-V8P2T0) on Amazon .ca on March 3, 2022, which broke on April 4, 2024. This product was used under normal conditions, and I believe it should be covered by the manufacturer’s 5-year warranty.

Several chat sessions with Amazon and Samsung support have failed to provide a solution, with each party referring the matter to the other.

I am requesting that you repair or exchange the product under the Consumer Protection Act regarding the legal warranty of the reasonable durability of a product. I am also requesting reimbursement of $25 to cover the cost of sending this letter.

Therefore, I am formally notifying you to resolve the above-mentioned issue within 10 days. Failing to do so may result in legal action against you without further notice or delay.