Sold an item on the 22nd. Got this message today.

"Hi there

I have purchased this item off you last week and you still have not packed and sent the order?

Could you please post this item ASAP, if no communication I will leave a negative and very detailed feedback stating you are unresponsive and a scam!
Legally you were obliged to send the order 3 days after I have paid.

Hope to hear from you
Thanks"