This should, and may have been, covered in your Divorce Decree regarding who pays for what debts and return of your personal property. Unless Storage company was a 3rd Party to your Divorce case (extremely rare), it is Not bound by the Divorce Decree. So, to stop the sale of your property I believe you may have to pay the bill (settle with Storage Co) and then go after your Ex in Divorce Court. Sitting on your property rights until after the Divorce became final is likely going to cost you more now, than before.
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