Write a letter of complaint. In your letter you should describe or report the matter at issue; make some form of complaint and demand a solution or compensation for the problem.
I am aware of your reputation for quality products plus reliability; consequently I do not hesitate to write to you.
For the past two years, my tow sons, ages eight and ten, have enjoyed your Electronic Hockey Game. The other day, a welded joint gave way and rendered the game absolutely useless. It was the joint that connects the side to the top of the game, and without it the playing area is too unstable for kind of action the game generates.
The purpose of the letter is to ask your permission to send you the set for re-welding.
Rainy days become quite dull for them without that game, so I trust I shall hear from you soon.
Very truly yours,