Repaired phone came back stolen ,and as a note 4.

I received my repaired s4 back I took it to the Verizon store to activate it .the s4 came up in system as stolen. I took it home, and the imei was different from the s4 I sent in. I checked the imei on a black list site, and the imei comes up as a Galaxy Note 4 not a Galaxy s4. The paper work I received said the device was repaired, and most of the internal parts were replaced.
What's going on ?

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