You should talk to your chapter 13 attorney.
The above is general legal and business analysis. It is not "legal advise" 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.avanesianlaw.com for more information about my services.
If you received a Chapter 13 discharge, this court order eliminated all of your personal responsibility to pay this debt. You may want to retain a bankruptcy litigation attorney to pursue the creditor for violating the bankruptcy discharge, which can include payment of the attorney fees as well as any damages you sustained due to this creditor misconduct. Hope this perspective helps!
Did you get a chapter 13 discharge or did you convert to a 7 and get a chapter 7 discharge? Either way, your personal liability on the note was discharged. The only scenario I can imagine where it wouldn't be is if the lender got relief, you converted to a 7 and indicated 'reaffirm' on your statement of intention and then reaffirmed a mortgage in foreclosure. If you were represented by an attorney, that didn't happen. I'm not even sure you can reaffirm a the debt after the lender gets relief - and I don't think the lender would send a reaff.
So no, you're not liable.