Hi Sjunky! What'cha doin here? It is good to see you! I guess you too have taken a jump to the Orange side (from Chanel). Unfortunately, it appears as though you are not happy with your new Birkin. I too have transitioned to the Orange side and have purchased 2 Bs and countless clic clacs, Kelly Double Tours and Kelly Dogs in 3 months. I have not returned either Birkin but was told that I could BUT that it wouldn't be a "good" option. As others have said, I am 100% positive you can return for store credit. But depending upon your relationship with the SA, you might not be offered another or to SO any time soon.
By the way, to echo Fishfood and **Chanel** above, what is the color, size, etc and what is wrong with it? Good Luck returning if you are unhappy.