My suggestion is that you write the attorney and inform him that he has violated several rules of professional conduct and that you will be forced to file a formal bar complaint against him on those matters if he continues to refuse to call you back or otherwise fail to attend to your case.
Hopefully this will "light a fire" under him and get him going. If not, find another attorney and contact your state's bar association about the attorney's actions.
That's certainly an option, too. An attorney wants a bar complaint about as bad as we want a hole in the head! He'll probably be willing to accommodate you to keep you from filing.
That is up to you.
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