Key alarm fob not working

Hi All. I bought a TF yesterday and when I got it home decided to change the batteries in both key alarm key fobs. Now neither of them work and I can't unlock the car. If I unlock the drivers door using the car, the alarm is activated. I've searched online and tried all the suggested methods - removing the battery, pressing both buttons to discharge any remaining power then standing next to the car and pressing either button several times. Nothing I've tried works, it's really frustrating, I've got a lovely new car parked outside and I can't drive it. Any suggestions would be gratefully received. The key fob is the round type.Thanks.

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