A letter/email rejecting the incorrect/poor quality good delivered. It describes the issue regarding the incorrect/poor quality product, and requests for a replacement/refund, and immediate attention to the matter.
We regret to inform you that we are rejecting and returning the [Products] that arrived on [date]. [[Products] were of incorrect [colour / specifications / quantity].] [They are not up to the usual standard of [previous orders] / [competitors] / [the sample provided].] / [[Products] do not conform to the quality [promised by you] / [expected for this product].]
[It would be greatly appreciated if you could send us replacements [by air] before [date] [and let us know if you would like to collect the delivered goods at the same time]. Obviously, we will not be responsible for the extra freight charges.] / [We would like to ask for a [full] refund of the inferior goods.] / [We would like to ask for a [discount]% discount on the inferior goods.] / [We would appreciate if you can send a technician to fix the defect immediately.]
not up to standard,