Got a similar call exactly the few weeks back.
They asked me what's my name is. I used a dummy name , say Sarthak.
And then they told the entire story that a package with your name on it has arrived from Russia , with 50 medicinal drugs and I don't remember but some stupid illegal stuff is found and currently at Delhi custom office or so and so on..
I then simply asked them my name again, they said the dummy name I gave them. I cut the call.
I was Able to conclude that they had only my phone number and not my name . It should have been very eash to find it but they lacked the technical awareness I guess