I tried to reach the seller and was advised that they do not send books or extend the offer. I tried to contact customer services and the automatic system is horrible.

purchased 4 books for a free book off. The 4th book was not in stock. I was not given another option | Ask a Mentor

purchased 4 books for a free book off. The 4th book was not in stock. I was not given another option | Ask a Mentor | eBay Community