marriage certificate

There is no such special/expert section as "Marriage expert".  If you require information on "Marriage certificate", just contact local Registrar of Marriages who sits in Registration dept offices.  The process of getting a certificate is simple.   If you can afford, you can also entrust the task to an advocate locally.

What is the issue and purpose of posting this question ?

If you intend to get married it is a separate subject, whereas if you want to obtain the marriage certificate it is altogather different issue  

Therefore, it is advisable to consult a local prudent lawyer with relevant records for appreciation, professional guidance and necessary proceeding.