Brake cable prevents handlebars from turning
Sounds like there's not enough slack in the brake cable outer.  Photos will help a lot - you can add them in with [edit]   My assumption is poor assembly.
It is fixable - You can buy more brake cable outer in a kit which should let you re-do the brakes on the bike.  But the bike is brand new and that really shouldn't be necessary.  You might choose to return the bike as &quot;unsuitable&quot; that's up to you.

Aside - we might spot other issues with assembly if you add some clear well-lit photos.  Add one from the right hand side of the bike showing the whole thing, one showing the handlebars area, and if you can a third showing the bike's rear wheel cassette and derailleur.