Please take note of following -
1. You should contest this case with your full might or else the divorce will be granted to your husband.
2. You should state your facts well before the court and shall produce proper evidence in that regard.
3. Since you do not want to give divorce to your husband so you should file a case of restitution of conjugal rights u/s 9 of the Hindu Marriage Act to get back into your matrimonial life.
However, I shall remind you that as per the orders passed by the Hon'ble Supreme Court of India "courts cannot force anyone to live with each other as a husband and wife". If your husband has filed a case of divorce, then it is most likely that divorce will be granted to him unless he fails to prove his case and you produce the evidences which can prove that you are right and your husband is wrong.