Dress issue

So I purchased a dress the first week of December. I called this last week to see if there’s an eta on its arrival as it’s been a few months and they told me mid august to sept! We are getting married the first week of Oct. 9-10 months turn around cannot be normal on purchasing a dress can it?! I don’t think I’ll have enough time for alterations! I do not have the budget to go out and purchase another expensive dress and am so torn on what to do here. Any advice? Is this shipment time normal? The dress is by the brand all who wander and it’s only about $2000, so not even a super high end custom dress.