Full story:

This company had a good deal on a textbook I needed for class, so I ordered it (as it was at a good price). However, 3 weeks went by without so much as a shipping label being created, so I contacted the seller about it. They blamed the local postal service lost the item, and "sent" me a new one. 10 days had passed, and they still hadn't sent me any shipping confirmation. When I asked about it again, they sent me a fake tracking ID. I ordered from a different seller, patiently waiting for the original book to come so I could return it. When I initiated my return (this is through Amazon, btw) I got an email from the seller asking me to send it to a different location, and that they'd "issue my full refund and pay for the shipping I would initially cover." I didn't listen to them, returned it through Amazon, and left a bad review on the seller's page. Woke up this morning to this message

EDIT FOR CLARIFICATION: this was a private seller on Amazon

UPDATE: After receiving 3 emails TODAY about their bad review, I have responded with the following, as well as reported their business practices to Amazon.

I am truly sorry that my feedback has negatively affected your business, but I will not remove it. To do so would be untruthful and deceiving to not only your customers, potential or existing, but also to you and I for being affected parties in this transaction. I hope you do recover, but I will not remove my review, and you asking me to do so several times has promted that I took action through Amazon against these practices. Good day