Thrifty Car Rental Thristy Misrepresented Facts and Required me to purchase unneeded Insurance Panama City,Panama International

I was quoted  a total price online via PRICELINE for $391.59.  When I arrived at the location, Thrifty Employee Abraham told me that under Panama law he cannot accept insurance provided by my credit card company Chase and I will have to purchase Thrify's coverage or he will not release the car to me.  Accordingly I purchased this coverage to get the vehicle.  Later I did online research and found out that Abraham misstated the facts to me and my credit card provided insurance would have been fine.  Upon return, I saw Abraham and he flatly denied that he required Thrifty's insurance.  He said that he told me that he could accept my credit card insurance and I chose to purchase Thrifty's insurance.  Abraham simply lied to me .  My online reasearch shows that this is the way Thrifty does buisness in Panama.  I understand that this is a franchise but Thrifty's Brand Protection should take corrective action.  Upon my return I called Thrifty's Customer Service and was told that since this is a franchise Corporate office cannot do anything about it.  I am a lawyer by profession and I refuse to believe that Thrifty's Brand protection cannot take corrective measures.  I ask that your office look into this and refund the excessive charge of $608.85.