Is this Herve Leger? I only ask, because I have never seen this design before, and I've seen a lot... :/
I really really hate to be the bearer of bad news, but this dress is commonly counterfeited as Herve Leger, but Herve Leger never produced this style. It was modeled after a dress that Kendall Jenner was seen wearing, but her dress was not Herve Leger.
REALLY really hate bringing this news. If you have any questions, just let me know. I know this news is really upsetting. You can also provide pics of the tags here, and I can confirm.
Anyway, I hope that you can still return this. My guess is that someone bought a real Herve and returned a fake Herve. D: Shockingly, this isn't the first time I've seen this happen. The last time, the return "fake" was SO SO bad. It was essentially a sweater dress with the original tags replaced with Herve ones!!