1. Make a product that breaks four months later.
2. Send them a refurbished replacement, despite their pleas to have a brand new model.
3. Make sure that refurbished replacement doesn't work.
Bonus: For extra added fun, make sure it has the same problem that their old one had. Then they'll really love you.
At least if they had sent me a new one, I would have had four months worth of printed pages, rather than.....oh wait, I can't print at all. I'll be updating my open letter for sure.