Curious what part of Florida you were in. Many of the toll roads in Orlando and other major cities do not even have toll booths. There is an electronic transponder you have in the car. If you do not have the transponder the system takes a picture of the car and license plate and you get fined.
That being said, the bill from the toll road is required to have a time and date stamped picture attached to it. You should be able to request a copy of this.