what can I do if the attorney I had withdrew from my case but he is still receiving my letters from the court an not forwarding the letters to me

If your attorney made an appearance on your behalf, then your attorney is the "attorney of record" in your case and all correspondence would be sent to him or her. once the attorney has made an appearance, in order to withdraw it would be necessary to file a motion to withdraw and notice all parties. An order allowing your attorney to withdraw would have been signed by the judge and all further correspondence would have then been directed to either you or your new attorney. The first thing that would need to be done to determine whether or not legal malpractice occurred is to obtain a complete copy of your court file