Worst kind of Frigate you could invest in.
If you keep it close to your shores, you should have invested in ground based anti-Air assets.
If you send it to high seas, its survival chance against Indian fleet is zero.
Wrong.
A Submarine ,once detected, is a dead sub. It could not retaliate against airborne anti-sub assets at all, and would find it very difficult to retaliate even against ship based anti-Sub assets. A frigate could retaliate in whole spectrum (Submerged,surface,and air) depending upon its capabilities. It has higher chance of detection but also higher chance of survival.
...............................................................................................................................................................................
And
@MastanKhan and other, who are advocating induction of surface ships at the cost of subs; how do you plan to protect those surface ships?
A submarine does need need additional investment in other assets specifically for protection of that submarine, but a surface fleet needs to induct anti-Sub frigate and other ASW assets for protection.
For India, any danger from Pakistani fleet comes from submereged assets, hence India has invested in and developed an expansive anti-Sub warfare arm, while in comparison, Pakistan's ASW arm is practically non existent.
If you people induct an Air-Defence or Anti-Ship Frigate, even a WWII relic could sink that Ship.
If you people induct an Anti-Sub Frigate, than a pertinent question would be: Why you inducted that ship at all?
In order to have a semblance of surface fleet, you would need to induct very large number of Ships. Couple of Frigates would be a complete waste of money.
Now don't bring P3C Orion into discussion. Handful of P3Cs against a Navy having carrier-borne Aircrafts and an Airforce whose operational radius out-ranges P3C's would lead to turkey shoot of a hapless P3C. It is not an aircraft capable of defending itself against proper fighter Jets.