Can I bring game extensions back to Playstation Store and get the money back?
No, you can't. Except when you bought this game it said that it is cancelable
Unfortunately, no, it would have needed it itself.
If the add on is buggy and you can't play it properly there's a chance
It is unused
It is not a game, but a game extension that has not yet been used
When you buy a game online, it makes no difference whether it is used or not.
Only the FernAbGabeGesetz would help you if you had bought it as a disc.
I have never heard of it and this is only a statement against a statement. I gave you my experience.
I've been there since PS2 and have bought most games online since PS3 … But I wouldn't understand the meaning of a right of return here, let alone understand it.
I can't tell you more than my experience and knowledge.
It worked.
How did you manage it? Never heard of it myself like I said… I would be interested.