Vauxhall Meriva central locking fault ?

Hi I have a 2011 meriva diesel 1.7 the door lock alarm was intermittently sounding the problem so Vauxhall say is the battery earth cable which needed rerouting (For which I saw the plans)so they know about this problem . When I phoned Luton they said they would do the repair on warranty but the paper work at the dealers said refused & I had to pay . Luton should stand up & admit the faults & create good customer relations . I will not be buying another Vauxhall.

David
February 2017