"I'm sorry, you can't return that."

Based on the hints given, I put "I am sorry, you can't return." What part implies "this"? Why can't Duo hint at it? (Or is my translation actually right?)

"Sorry, you can't get a refund" should also be accepted.

You can't return this I'm sorry should be accepted

How can "this" be included here? There is no 这.

why "this" has come in the english translation

I think this excersice needs a specific noun the first time we see the verb “退货”. I thought the answer was “I'm sorry, you can't return” meaning “you can't come back here” or “you're banned from here” I need “你不可以退货这双鞋子” or something to show which sense of the english word “return” “退货” means