RIGHTS ISSUE OF PARTLY PAID UP SHARES PAS 3 FILING BY PVT LTD CO.

Dear All,
Suppose a Pvt Ltd Co. is issuing Rights issue of shares at 10+25 premium in 3 tranches 1) 5+10 as application and allotment money 2) 2.5+7.5 as First Call money and 3) 2.5+7.5 as 2nd & Final Call Money.
So i need to know:
Ques 1) whether PAS 3 has to be filed once at the time of receiving application and allotment money or has to be filed each time at the time of receiving money i.e at the time of receiving 1st Call and 2nd Call money
Ques 2) if PAS 3 has to be filed only ONCE then how MCA portal will be updated online as at the time of allotment PAS 3 will be filed as partly paid up shares and NO PAS 3 has been filed later so how MCA will be knowing that partly paid up shares has been converted into fully paid up shares.
 Will be highly obliged if anyone can answers the questions as stated above.
Thanking you
CA RAJAT