well i think you need to contact the car rental company and ask for the copy

of invoice that shows the catagorized charges of loss of uses and adminstrative

mentioning your name and details and provide the copy the american express and then

check how it works otherwise you may need to defend yourself asking your rights to see

the details of charges. make sure they may increase the charges and also make sure

that they have not rented out the car. because they may have charged you also and at

the same time they may have put the car on rent. loss of uses is only those days when

they were unable to rented out the car. i think you need to find a good lawyer as well.