I think that will only be possible via customer service.

Correct, if the details on your mobile Pass are incorrect, please get in touch with our customer service. If your Pass has not been activated yet, we will be able to change the information for you.

I tried, but they don't answer me and I start travel next weekend. 

Moderator note: capital letters have been removed. 

Hi, our customer support team is working in order of priority (based on travel date) so they will get to your message as soon as possible. 

I HAVE BOUGHT ANOTHER PASS (ZBCV1H) AND I WILL CANCEL THE FIRST ONE (4X6XK3) LATER ON, THE LAST DAY BEFORE START MY TRAVEL , IF I DONT RECEIVE ANSWER OF THE COSTUMER SERVICE.

I HAVE NO ENOUGHT TIME TO WAIT COSTUMER TEAM ANSWER. I HOPE I WILL HAVE NO PROBLEM FOR CANCEL THE FIRST ONE. WHAT DO  YOU THINK ? I WILL KEEP THE TWO PASSES UNTIL THE LAST DAY...AND THEN WILL SEE WHAT OF THOSE I CANCEL

Hi, our Customer Support team responded to your message just now. Cheers,