According to the site, what kind of information should the customer include in a letter of complaint?

A letter of complaint may include the following

day and dateaddress where letter will be sentaddress of sendersubject:why complaint is being donedate of purchase,model,serial numberwarranty period :whether under warranty or out of warrantyGuaranteeis product under any guarantee ?suggestion as to how to resolve particular complaintthreat::if the seller does not pay attention to your complaint,you might go to Consumer Court.

The best answer in my opinion would be the last one. i hope this