Monnicaji,
1. First, do not jump to conclusions.
2. By your query, I understand that he has shown decree certificate to you. Then you must have got either original or photocopy of the decree. In that it must have been mentioned the name and address of the court, next case no. and later on party names (both husband and wife), last at the end of the decree/judgment the date of the decree, and finally, the signature and name of the judge. If the court lies in the place, where you stay, go to the court's office and enquire from there. Most probably, the files of the cases, which had been decided would be sent to the Record Room. So, this file must have been sent to the Record Room. On plain paper put an application seeking the inspection of the file and affix the court fee (normally it will be around Rs.5/- only) and submit it to the Incharge. He will get the file for your inspection. Sometimes, the file will not be sent to Record Room and will be lying in the court office only. If so, the record clerk (generally called Ahlmed) will show it to you after you move application as said above. With a nominal costs you engage an advocate at the court itself for the purpose of inspecting the file and on the very day the advocate get the file and you yourself can inspect the file.
3. If the case No. and parties are not tallying, the court office will search the exact case which bears your husband and his exwife's name and you can inspect that file.
4. Now, if actually there was no divorce case and divorce decree and your husband beguiled and tricked you, and the divorce decree you had was a fake, then Ahlmed's search by the case No. and also by year and by titile will bring out the true facts. For example, if the case no. isxxxx/14, the Ahlmed will search 2014 cases with titles and find out if any typographical mistake happened in the divorce decree you had in your hand. Similarly, he would try to trace out if any such case was there in his court with the title of your husband and would help you in this regard.
5. Why I am saying this is, sometimes, case numbers will be typed wrongly or not properly uploaded causing consternation in the public.
6. After your online search and personal search by visiting the courts, if you come to conclusion, you have been cheated, then you must understand that your marriage is invalid in the eyes of law. The course of action is to get your marriage declared null and void and at the same time,simultaneously initiate prosecution for bigamy against your socalled husband, which attracts imprisonment. You can also get civil damages, even though in India people will not pursue such path of seeking civil damages.
If any further enquiry is required in this matter you can call me on 9868332610 between 5 to 6 PM.