Did Raghu ever mention that he actually saw the killer, when he or she contacted him, in the first place? If not, then this could mean that Raunak is not the killer, cause what if the killer contacted him over phone or sent someone, but gave Raunak's name.
Hence Raghu then tries finding out who he is Raunak and actually sees the actual Raunak. And assumes it is him, therefore taking his name when he died.
Cause when Raghu was murdered, it was Bikram who bought the rope with him, so my guess is that the killer is more than one person.
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