Gps Activation HELP

I received the real time micro gps tracker and i have been trying to activate it since yesterday afternoon and i need to attach it to my car within the next few hours before someone borrows it and i keep getting this error message that says it was denied because the address provided does not match cardholders address but ive done it so many times and the address does match so im at a loss as far as what to do from here please let me know if i can pay with paypal or if there is something i can do asap so i can get this activated and attached. thank you so much for your time - Sarah