Devorce

have you got divorce through a court degree.if not his marriage with somebody else would amount to bigamy

UR query does not yield any substance.Lawyer prepared document,U got it notarised and he after 6 months he married again. Where on earth can U get that divorce certificate? 

law stipulated procedure is there to get divorce from court

mutual consent divorce and contested divorce

and in your case you both mutually agreed and drafted a deed and being notorised by notary which is not valid in the eye of law

so already you both have decided to take divorce then apply for mutual consent divorce before that first meet a local lawyer and discuss with him what all points to be kept in that and both come with an understanding and draft the petition and file within 6 to 8 months you both will be divorced and even you to can marry again legally

Gita, if you both mutually agreed for divorce then don't make it much complicated now. Both file a petition u/s 13B HMA for MCD. 

I advise you not to go for any bigamy suit or anything else as this will consume your time, mental agony & money too. Better, as you have already decided and living separately go for MCD. This will make things simple and you will get your divorce certificate too.

The notarised one which you have is not legal divorce.

His second marriage is not valid till he obtains divorce officially. Act according to the opinions of the other experts.

The one what your lawyer done is not a legally valid divorce.  So any certificate based on this is also invalid in the eyes of law.  Better to apply for divorce in the court of law with the help of another good and genuine lawyer under mutual consent and get your marriage dissolved by a decree of divorce legally.