The second picture could look like the fretboard separating, but the other picture clearly shows the crack extending down the body of the neck . Someone dropped that poor guitar and it is broken. I would consider it the same as breaking off the head, as that looks like almost what happened.
String tension is going to pull and continue to make that worse.
I bet it can be repaired, but It should have been fully disclosed and discounted. You shouldn’t have to deal with or pay for it unless you agreed to that upfront.
Send it back. Make sure they reimburse any shipping costs.
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