Thanks for your kind answer and takind your time to read my comment.
Well, I don't want a refund from minnowbooster, as it's not their concern, it was my own mistake.
This service would be really nice, because mistakes can happen everytime; the possibility to reverse them will put even more trust in steemit; I mean, you are even able to edit a post up to 7 days, so of course there should be an option to "edit" aka reverse transfers.
Have a nice weekend!