Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
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It sounds as if you have a keyless entry issue and the power locks do work correctly. If the power locks do work but the vehicle does not respond to the key fob then you either have a bad fob or a keyless entry receiver issue.
If the fob battery has been replaced then the next step will be to have the fob tested to see if it is transmitting when the buttons are pressed. Most shops and any dealer will have a fob tester, and most big chain parts stores such as Autozone here in the US will test fobs for free.