Dear General Manager Mr.XXX
With all due respect, I am writing to you a serious letter to get either refunded or exchanged on a washing machine purchased at your department store on 17th, May.
Only two week from the date we made the purchase, the machine was no longer functional and remained broken after being repaired again and again. I suspect the authority of the salesperson to make the decision, and therefore I am turning to you for your kindly help.
Sincerely
XXXXXX