1. The last tracking of your parcel is this:
20/10/2016 08:31:00
Country: Tanzania, United Republic of
Location: DAR ES SALAAM
Event type: Unsuccessful item delivery attempt (Inb)
Mail Category: Air
Reason : Addressee has P.O. Box
Measure : Item being held, addressee being notified

2. You should phone here at the Tanzania Post Office in:
Dar es Salaam
022-2138012

3. Just for your information this is the full tracking of your parcel:
Number: RB098384435SG
Package Status: Undelivered

Destination Country: Taiwan [CN]
2016-10-20 08:31 Tanzania, United Republic of, DAR ES SALAAM, Unsuccessful item delivery attempt (Inb), Air, Reason : Addressee has P.O. Box, Measure : Item being held, addressee being notified
2016-10-20 08:27 Tanzania, United Republic of, DAR ES SALAAM, Handover item to delivery agent (Inb), Air
2016-10-20 08:05 Tanzania, United Republic of, DAR ES SALAAM, Update item (Inb), Air
2016-10-19 11:27 Tanzania, United Republic of, DAR ES SALAAM, Send item to domestic location (Inb), Air, DAR ES SALAAM
2016-10-19 10:40 Tanzania, United Republic of, DAR ES SALAAM, Receive item at office of exchange (Inb), Air, DAR ES SALAAM
2016-10-18 07:45 Kenya, NAIROBI CITY SQUARE, Send item abroad (EDI-received), Air, DAR ES SALAAM

Origin Country: Singapore
2016-10-20 08:31 Attempted/Failed Delivery (Country code: TW)
2016-10-19 10:40 Arrival at Processing Center (Country code: TW)
2016-10-14 10:20 Arrival at Destination Post (Country: KE)
2016-10-14 10:18 Arrival at Processing Center (Country code: KE)
2016-10-11 14:43 Despatched to overseas (Country code: KE)
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Hope this help.

1. You should phone here at the Tanzania Post Office in:
Dar es Salaam
022-2138012

2. Or go there and pick up your parcel.

Hope this help.