I'm sorry that this happened to you, and I certainly understand your frustration.
However, I highly doubt that Chase is under any legal obligation to give you any assistance in this matter (at this point, at least).
This is just something you're going to have to let the cops deal with. File a criminal complaint (not against Chase) regarding what happened. Hopefully the police will put some time into finding out who did this.
If and when the perpetrator is tracked down, you're recourse, per the law, is going to be against that person, not Chase. Chase may be a bit more receptive to helping you out if someone is charged with fraudulently using your card, but I doubt that they would be required to do so.
Again, I'm sorry this happened to you. But I'm afraid you may just end up taking the hit on this one.