It sounds like the case head has separated leaving only the calse walls, shoulder and neck jammed, I think.What calibre?
You can buy case removal/extractor tools but it's also possible to do it with correctly sized bolt with nut & washer plus a couple of spanners.
For removing separated cases from rifle chambers - no good for getting them out of sizing dies.
p&r cases ?????p&r cases , shot 4 time, seems odd