You should speak to the clerk's office in your county to determine if your divorce case is still active.
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If you have determined that the case was dismissed in July and it was under the same case number, then it appears that your wife's lawyer has mailed you a petition that is no longer valid. Since you were not served, your failure to answer the petition within 20 days does not create a situation where you can be defaulted. It appears from your question that you are interested in moving the case forward, so it may be best to contact your wife's lawyer and discuss the current status of the case with him. He may be unaware that the case was dismissed, and can take steps to re-file the petition.
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