Following up on ForgeValley's post - remove the die from the press. Using the appropriate drill bit, drill out the primer pocket and tap the hole you just made for 1/4x20 thread. Spin a nut all the way down on a 1/4x20 bolt. ForgeValley is using that big nut because it provides inside-diameter room to pull out the case, the die ring and the washers provide spacing and something to push against. Set up a spacing like you see, insert the bolt through the washers and spacers and screw it into the tapped hole on the back of the stuck case. Use an open-end wrench to turn the nut away from the bolt head. The bolt is engaged in the case. As you turn the nut away from the bolt head, you are pulling the bolt out of the die and bringing the stuck case with it. The case only has to move less than 0.030 (about half a turn) to come free.
When drilling out the primer pocket, do not mess up your ejector pin or drill into the die body.
This is not a big deal to do. After you have done the first one, you will think, "that was easy!" The solution is "use enough lube".
RCBS and others make a "stuck case remover" kit that contains all of the parts you need. Google or check Brownells or Midway.