"...But we're not going to answer it." 

Actually, I'm pretty sure they didn't even read it.

Via a website form, I sent the following email to my local company that supports those auto toll tags:

"I have misplaced my tag so I don't have the tag number or account number.  I need to cancel this account and create a new one."

In reply, I got back:

"To help access your account, please check your EZ-Pass device for the issuing agency's name and telephone number.  Please resubmit your request to that agency via website or telephone.  BE SURE TO INCLUDE YOUR DEVICE NUMBER OR AN ACCOUNT NUMBER."

...thud (my head hitting the desk).