Olympus E500 not working with Olympus RM-2
I bought a simple official Olympus remote RM-2 for my E500 camera but it doesn't seem to work. The signal is good, I have checked with a mobile phone to see the infrared beam coming. I have the right remote control camera mode, I've tried both the instant and 2 second delay remote modes countless times. The store treats me like an idiot and says I probably run out of batteries and am not using the right mode.
What could be the fault and can anything be done to get it working?