Will never rent a car from Europcar again

I rented a car@ King Shaka Europcar.The person helping me just informed me of the administration fee which made the rental amount higher than what I saw on the Kulula website(with Vitality).He did not inform me that the car has an e tag&how the e tag works.I drove to PMB&paid cash@ the Marianhill Toll Plaza.I returned the car at the next morning&no one was at the counter to receive the car (@Oribi).I spoke to another rent a car agency to find out what to do.When I received the invoice,I saw an item called etolls which I thought was confusing as there are no etolls in KZN.I emailed the email address provided immediately&did not receive a response for days.I eventually called customer service last week&queried the etolls.The guy said that the assistant at Europcar should have told me that the car is equipped with an etag&how it works&I should be getting a refund.Someone then responds to my email&states that its the renters responsibility to know about the etag.I am extremely irritated at the customer service at Europcar as they did not inform me about the etag&are doing nothing to refund me for their POOR customer service from the time of renting the car to receiving the invoice