Gst - gstr-3b return which ???

Dear Sir,

one company registered with Partnership firm with 2 person  (rames & jatin )partners last few years , now a days disputes among  partners , so the partnership firm dissolution beginning of 1st july-2017. and the same business carried by one partner as a propritorship business also he had apply for new gst number - for INDIVIDUAL   [JATIN]

now case before dissolution firm they have already registered with GST portal - also ve GST TIN Number.  [FIRM ]

jatin has carried the business and issue GST Bill  to Purchaser but GST NUMBER MENTION ON BILL [FIRM GST NUMBER] 

Jatin thought individual GST Number will be come withing maximum 15 days but now GST  INDIVIDUAL TIN Number come on 25/08/2017.

so sir now we listing GSTR 3B Compulsory filling for all Registerd GST Number 

?????

Thanks Sir ,

please Guide early as possible SIR