Cjb / kvm issue in land rover lr4

I recently had a bad experience with LR4. I couldn’t start my car with keys...I changed the battery in key, still didn’t start the car....called dealership....they asked me to get my car towed to dealership......they diagnosed the problem.....they said control junction box & keyless vehicle module are malfunctioning and if I want to fix it then it will be $3857 plus tax....is there any other cheaper way of fixing this issue.
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