I recently purchased (item) from your store. After some time, my new (item) stopped working and I tried to return it to your store. I was treated very poorly by the people at your customer service desk. I'm appalled at the level of service I received. I'm so...
Dear (recipient's name),
I recently purchased (item) from your store. After some time, my new (item) stopped working and I tried to return it to your store. I was treated very poorly by the people at your customer service desk. I'm appalled at the level of service I received. I'm so disappointed that I will no longer be shopping at (company).
Sincerely,
(your name)