Dear Felix
I understand that your [PRODUCT, ex. Magna flux compressor] (invoice #[INVOICE NUMBER]) was delivered in an unacceptable condition. I will immediately ship to you a replacement. {STATE INCENTIVE, ex. Since I am embarrassed by this matter, I will discount the replacement order by 5%. The difference will be credited to your account}
Call me at XXX-XX-XX if I may be of any other assistance.
Regards
Lydia