If it’s not responding when plugged in correctly, you are almost certainly fucked. I have never seen this level of physical damage to a CPU and had it still be functional. This is severely bent for a PCB, it has a visible crease in it, which means a break. You have likely broken circuit traces and/or solder connections between the silicon and the PCB. I doubt you’ll be able to return it with this level of damage, so I guess you might as well try bending it back, but you will probably just break it further. The bend is preventing the contact points in the ball grid array from touching the corresponding contacts on the motherboard, so there is a very slight chance that if you bend them back so they all touch when you clamp it down, it could work, but I would keep my expectations low.

It’s a shitty way to learn the lesson about taking your time and paying close attention when assembling your computer, but hey, now you know and hopefully won’t do it again. All PC components are made to fit only in the correct orientation, and forcing them to fit in the wrong orientation will usually destroy the component, the motherboard or both.