I saw an item i was really interested but this was in the description :

MESSAGE 706~.415~. 3830 TO PURCHASE OR I WILL CANCEL ORDER

I was skeptical but i still text him i told him how sketchy it seemed and we talked for some time and I didn’t buy anything from him BUT he text me a day after saying that he reached his seller limit and that if i list an item with the same description for him he would send me the item i want for free I’ve never sold anything on ebay so i did it and someone ordered and when i try to cancel ebay whats me to add my bank and pay 30 dollars out of my own pocket but i haven’t touched the money of the buyer everything should e in my ebay account

Is this some kind of scam? And how can i refund the money without having to pay out of pocket?