Hi
@Gobinaath bro. Hope you are well
This is a very confusing thing by Vi.
Pack Validity means how long it will be valid in ur account/number.
Service Validity means the validity for outgoing and incoming calls.
Example:
Rs 48 pack has 3GB, 28 days "pack validity", but no "service validity"
So if your service validity is expiring today, and you took Rs 48 pack today, you will not be able to use that pack from tomorrow (although it is "active" for next 28 days).