JP Morgan Chase & Co. Chase Bank Refuses to reimburse me for forged check with obviously bogus signature

To start out, the check was written and cashed for over $1000 to a Christopher Pritt in bubbly, girly handwriting not resembling mine in the slightest and a signature also done in a polar-opposite fashion. If that isn't frusterating enough, Chase Bank cashed the check at one of their branches for this person, presumably on camera, and insread of pursuing the person guilty of fraud and forgery, blames the incident on me by telling me I've neglected to "lock up my checks" and denies reimbursing me the money.

I can only talk to the fraud department over the phone where they hang up on me. I asked the representative where she keeps her checks, and she said she keeps them "in her purse", which I doubt is made out of iron and locked as they apparently expect their customres to do. I've asked how they come to these decisions, and I'm told that their policies are "not for customers to know". I've never had this happen to me before, as I am not a fan of checks, but never would I have thought that a banking institution would ever handle it this way. I am an intelligent and reasonable person who doesn't go through life complaining in order to get my way, but I would have absolutely thought that Chase would be reimbursing my money that I assume is insured and pursue the actual perpetrator instead of sticking their customers with the consequences of their failure to compare a signature on a check before cashing it.

Everything I've read online and heard from bankers at branches seem to point to this being highly unusual for the bank to refuse reimbursing a customer their money in such an event and I am out of ideas and options, so I have ended up pulling my money out and walking away at a loss.