wrongIn which case he should have got an invoice with a 50% discount off the third item. It would appear from the buyer that the invoice sent was the total amount for the 3.
Never let me near a shop offering buy 3 get one free . Buy 3 and get an additional one free fits into my obviously warped shopping logic but if I see buy 3 get one free then my shopping brain is somewhat out of touch!
Ok so I know that I am wrong........