Μετάφραση - Ελληνικά-Αγγλικά - Κυριε αδαμο διαπιστωσα την διαφορα τιμη στην...

Original translation prior to editing: "Mr. Adamo noticed the price difference in your order and asked the board to spare you an extra 10% discount"

Question
a)Is the "Spares Part Department" acceptable in general? I know it's used but I don't know how often. Any apostrophes needed?
b) I don't like "spare" here. The original says "make you a [...] discount".



CC: kafetzou samanthalee

not to spare you an extra 10% discount but to give you an extra 10% discount