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                         copart seems legit enough ! 
so did you get the reg number of the suposed car you own ? 
You said the caller new your full name and tel number ! what about the address ? 
Have you tried calling Admiral ? not that I hold much hope of explaining to some one  the situation ! trying to get hold of a supervisor in nigh impossible at Admiral ! 
It would be worth while pusuing to make sure you have not suffered an identy theft and someones bought a car with your credit rating ! 
                            
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