First of all,don't pay a dime until the bill actually comes your way. I did the same thing in a rental car and never got the bill. Came to find out that agency had a transponder for that car and it only cost me the actual toll amount ($1.50 i think plus a few bucks for the transponder rental use).
If you went through the toll illegally without a transponder, then the license plate is captured and the owner of the car (the rental agency in this case) will be sent the violation. They will then bill you. The fine for those tolls is $100. There are signs everywhere!
But don't just send Sunpass any money assuming you owe something. I would think you could use a credit or debit card if you needed to anyway.
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