Manish, your frustration is very genuine.
But just consider this (personal view):
It is true that it has been 4 months since ur MR but if you will observe, NDVO started to issue PPRs from Dec'14 mid week.
NDVO did not start PPR for anyone before that, may be according to their schedule.
Many applicants who had completed their MRs in Sept or Oct or Nov were issued PPR recently.
So, though you have completed 4 months...but the pre-determined schedule to start with PPRs began from Dec'14 mid-week eventually.
Hence, you should be ready to hear good news anytime from now.