TomTom Via 620 Personal Navigation Device

Bought this GPS few weeks ago. Keyed in singapore postal code 239035 and I get UNNAMED ROAD.
Use my 5 years old Shinco and I get to that place. When I email to TOMTOM, they say, I need to update my unit, but I just got it updated before I email. I updated again, and map is updated as of today 23 November 2012 and the place is still unknown. TomTom email me back and ask me update map again and direct me to do this do that and ask me to submit the error. COW! I became the map updater.! Instead of quickly updating the map, they ask me to do so and tillnow, singapore postal code 239035 is still unnamed. For your info, it is SRT, DBS Arts centre, Merbau Road ~~~BUY THIS GPS ? Think 3 times ! maybe more unnamed road.