After he approached the Byculla police in central Mumbai, a case of cheating was registered against Flipkart.
Tabrej Mehaboob Nagrali, the complainant, said he had ordered an iPhone-8 on the shopping portal and made the full payment of Rs 55,000.
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On January 22, he alleges, the package delivered at his house in Panvel in neighbouring Navi Mumbai had a detergent bar inside instead of the premium mobile phone.
"Nagrali approached us with a complaint yesterday, and an offence of cheating was registered against Flipkart," Avinash Shingte, senior police inspector at the Byculla police station, told media.
A Flipkart spokesman told media that the company is conducting an inquiry into the incident.