You don't like the puddle action your 'gale delivers when you hang it on your shoulder?
Hmm, how about you don't carry it that way then
Okay, being serious, if there is an aspect about the bag that bothers you, you can get rid of it. I will say, I despised my 1st 'gale (but for other reasons) and didn't fall madly in love with my second, but kept it and it is now a staple in my collection. So, for some, a piece may just grow on you.
If you are not that kind of person (willing to wait a bit to see if a bag 'grows' on you) then please return it and apply your funds to something else. Say, the Antigona, for instance. Its a structured bag that seems to hold its shape (Ciara literally carried hers every single day for months and the bag didn't budge).
Sorry your nightingale is not doing it for you. I suggest keeping it (because its such a beautiful bag and Givenchy colors are superb). But, you have to live with it and if it doesn't sing to you honey, then you know what to do.
Good luck!