[NAME, COMPANY AND ADDRESS]
I have just received your shipment of [PRODUCT(S), ex. 100 sheets of 8x5 drywall], which we ordered on [DATE] (a copy of the sales receipt is enclosed). Since I know of your reputation for quality, I was surprised to find that [STATE NATURE OF BAD QUALITY, ex. a good portion of the shipment was cracked]. Nonetheless, I am certain that you will be pleased to re-ship our order. [STATE WHAT WILL OR HAS BEEN DONE WITH CURRENT SHIPMENT, ex. Your trucks have taken the original shipment back to your premises.]
Sincerely,
