Miss Lola black tube top maxi dress

I literally just got this in the mail and I don't like how it looks on me. I need a bigger size and the bigger size is sold out and I cannot return this to the store. never worn only tried on. NWT. just trying to make back what I paid. Fitted yet flowy black maxi dress I'm 5' 11" and it is long. Really wish I could get a bigger size because it's super cute.