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Was there a trial before the probate court and proof provided in court? Has the matter actually been heard and did you file a motion in the court for ownership
of the bond?
If you went through the probate court hearing and the judge denied you, then that is a final judgment and from that you have to file a notice of appeal and file your appeal to the court of appeals, that is the proper legal way to dispute this.
If all you have right now is the probate clerk and the attorney denying your claim to the bonds, then you need to start by filing a claim against the estate by filing a motion for ownership in the probate court and having a hearing where you will be able to present your evidence proving all of those statements are false and slanderous (if the court agrees with you, then you can file a motion for sanctions against the attorney and estate and get the court to award you damages on top of the bond for their improper false statements trying to mislead the court).
However, complaining to the DA or the US Attorney or US Treasury department at this point is not going to get what you need. You need to pursue the legal process through probate court first and then to the appeals court to prove your claim and prove their statements are false and slanderous as you said and then seek sanctions against the attorney for making them.