You think there is a violation of the say but I don't understand the timing. Was there a say when they repossessed the car or was the car taken in the interim period between filings?
Be sure to designate "best answer." If you live in S. California, you may call my firm for a consultation 818-507-6000. The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here. Please visit my web site: www.tilemlaw.com for more information about my services.
When did they take the car: before or after filing? Have you sought an extension of the stay? What is their reasoning for repo-ing the car? How do you treat the debt on the car in your new plan?
You may need to file a motion for sanctions for violation of the stay, or a motion for turnover. Without knowing more about the issue, it's hard to say what you should be doing, other than obtaining counsel to address these concerns and make sure you understand and can enforce your rights.