Start by filling a claim against him to the Texas state Bar. Make sure to have a copy of your retainer agreement and copies of communications you had with that attorney.
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You may have to file a Complaint with the State Bar in Texas and/or California if the lawyer has failed to respond to a demand for a return of unearned fees.
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First look at your contract.
Second even if you file a complaint with the bar they can force the attorney to refund any money.
Third he is not and can not on his own to withdraw from your representation while your case is in court. He needs a judge to allow that.
Fourth if you have a new lawyer then that's the one who must file appearance with court first then ask the judge to allow substitution.
Fifth if you must then you can file a suite with small claims court where you are to see if a judge will grant you any relief and mKe the attorney to refund.