How many mi ...and how long have you owned it? I assume you're talking "UPPER" ball joint, right? Show us a picture when you get it out.
If you watch this video, I can see how something like that could happen.
https://www.youtube.com/watch?v=pe99ri8eve8
I recently could NOT remove my old bearing/hub assembly last week, it was just rusted on hard (winter salt). But I sure as heck didn't take a jack to it! ha ha. Most ball joints these days use a nylon bushing inside and a polished stud. It would be easy to crack that nylon bushing with too much force in the wrong direction. I removed my rig's spindle (fairly easy) and it came out pretty easy on a press. That took less time than running to Harbor Freight to buy a jack, and sift around for a bunch of boards, etc.