Car will not start immobiliser light is on, renault claim its ok

2003 Renault Laguna 2.0 il auto
Car: Renault Laguna
Year: 2003
Variant: 2.0 il auto
Categories: Running Rough, Starting & Power Loss
I have a renualt laguna 2.0 2003 i put key in to slot to start and all i get up on dash board is one red light and nothingelse. The key unlocks and locks the doors fine. Unplugged battery and refitted and nothing car was working fine before happened overnight. please help
Problem added: Jul 22, 2015 (8 years ago)
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