A new bass so messed up that it needs neck shimming needs to go back for replacement.
The op needs to take the bass to a tech who knows what he is doing. Also, most of the basses coming out of San Louis Obispo have neck shims -- it's common with bolt on neck basses.
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Lubeck here is the world's foremost appraiser of vintage pastry.
I do find most basses, about 80%, I've been shipped did need a neck shim, but now we know that MF will pickup the return, I stand by my first post.......send it back.
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A world without music would be wrong!