I would call where you got the tree from, and ask them. Many tree nurseries have a guarantee. I know Home Depot does or did.

Leaves should not be turning brown or falling until Feb - Mar.

I would call whomever you bought it from, find out their guarantee. A month ago it was still pretty warm, and it may be suffering shock and will recover in the spring. I just had a peach tree, a crepe myrtle and another tree replanted when I turned that area into a big flowerbed, they're not looking great but are still green when I scrape the bark with my fingernail. Hopefully it's just shock from the moving!