You can pursue this matter in bankruptcy court by commencing an adversary proceeding against the debtor.
Lawsuits filed in bankruptcy cases are referred to as adversary proceedings. You may be able to find sample forms on the bankruptcy court's website in your district. The bankruptcy court clerk will also be able to assist with information regarding the procedures to follow to commence an adversary proceeding in your district. Since you are doing some preliminary research on the internet, you should know that a nonexclusive list of adversary proceedings is set forth in Federal Rules of Bankruptcy Procedure Section 7001.
You don't need to write a letter to the trustee, but you should contact the trustee's office asap to determine the status of the case, because you need to make sure that the time to object to the dischargeability of your debt has not passed.
I hope you found this information helpful.
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