The beautiful housemate had expressed her gratitude for her stay in the house and offered Biggie her necklace in exchange for the gifts and food he gave her for nine weeks in the house.
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However, Biggie did not acknowledge the gift without any reason.
Nengi made the offer during her diary session as a token of her appreciation to the organizers.
Meanwhile, Nengi is among the top five finalists battling for the grand prize worth N85m.
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The winner with the highest votes on Sunday emerges as the winner of the BBNaija lockdown edition.