Well, I had a customer open a PayPal dispute over an item that was back-ordered and I could not guarantee them a date of delivery. As they knew that from the start, they still pursued the order. They repeatedly tried to get me to guarantee a date of delivery, I stated I could not. So finally, after I sent them a tracking number confirming the delivery has been sent, they opened a PayPal dispute and requesting a full refund. They haven't even gotten the package yet. As an ex-Military Clerk, I have saved all information regarding this sale on my computer, and can verify everything. Does this make any sense? Or is this just a customer I should blacklist?