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How can I fix the mobile antenna on my Cubot GT99?

So I bought a new GT99 (mtk6589 based) and put in a SIM card. No signal.... I checked for the signal strength and it says "0dbm, 99asu".
All of my other phones work fine and the cell tower is just on the top of the hill so there is no reason for the phone to not pick up a signal. Even without a SIM card inserted, the phone should pick up a signal for emergency calls but there is no indication that there is a signal for that either. Does anyone know how to fix this?

Return the phone for a new one. Don't try to fix it when it should still be under warranty and the store should replace it for you if not the manufacture.