Avis Car Rental Car rental overcharge Parsippany NJ

After 40 years as an Avis Car Rental Wizard member, I was so disappointed with my most recent experience that I cut my membership card in pieces and will never rent from them again.  I booked a car through Avis' website for a one-way trip from Ft. Lauderdale, FL to Jacksonville, FL and received a quote for an estimated total cost of $125.02.  When I dropped off the vehicle at the Jacksonville airport, I was charged $480.31, including $348.48 for mileage (352 mi. at $0.99).  This came as a total surprise to me as every car I've ever rented from Avis and its competitors have always included unlimited mileage.  I was not informed by the Avis agent when I picked up the vehicle that mileage would be separate, otherwise, I would have booked with another company.  I contacted Avis' Customer Service a couple of times, as well as their escalation desk to request that they honor the original quote and their response was less than satisfactory.