Complaint Review: e-470 colorado public highway authority

We are not familiar with electronic only toll roads. We traveled to Colorado for a family vacation and did not find out that we had passed through Colorado's electronic toll road until our rental car company nearly 3 months later 'stole' 94.30 out of our account for the supposed 3 times of our passing through this monster and not paying the toll. There is no way to pay the toll other than to be billed for it, we never received a bill. We travel extensively for work and live out of our travel trailer. If Colorado did attempt to send a bill there is a huge possibility we crossed paths with it enroute to our next job. Our car rental company charged 25.00 for each 'violation' but was gracious enough to waive that but still bill the $8.00 that Colorado charged us and a supposed $11.00 the state billed them for the sake of highway robbery!! This should be illegal!! We paid every toll there and back to either a manned toll booth or dispenser. Looks like a Colorado campaign to kill tourism. hmm.