firm pancard , partner names

I have firm pancard.but I don't know who is partner of in that firm.when we taken firm pancard on that time strictly we don't know.why because pancard applied another person ,now that person not available. We started new business recently on that firm base. But now i am facing problem on GST and income tax return filing.plz suggest me.how I can know that partner particulars.plz help me.