Your options are to shoot it, throw it away, sell it to someone else, or contact the vendor.
With the latter you can send them a pic of the ammo, take measurements of it, and see if they will pay for the return shipping as the ammo is sub quality.
With shooting it, take pics of the ammo and if your gun blows up you'll get a new gun cuz you can blame the ammo provided you make a case for that with the manufacturer.
Either way make a decision.
What would happen if you tried the ammo and none would feed? Well you'd measure it, see that it was off and contact the vendor and or manufacturer. So why not that here?
You buy something on line. It arrives. You open the box. It looks off to you. What do ya do? Doesn't matter if it's ammo, shoes, bargain socks or Lego Batman...a small item of everyday life. Hardly worthy of notice.