Thrifty Car Hire Extra Insurance added without knowledge or consent Seattle Washington

I pre-booked a car rental with Thrifty from the UK to be picked up at SeaTac Airport (Seattle, WA)  When I saw the representative at the desk we completed paperwork and I was told that all charges were covered from my pre-booking. I was then asked if I wanted additional coverage, which I declined.

I was given a "summary" of my rental costs (I did not receive an invoice from the UK operation) and I was asked to sign the rental agreement, which I did.

On my return to the UK my credit card was charged with an additional $496.49 !!  When I queried the charge I was told that I had agreed to the additional coverage, which I certainly did not agree to. As a matter or principle, I never take additional insurance whether it is on electrical goods, loans, vehicle hire or any other item - it is a waste of money and in most cases, unnecessary.

I would have been expected to be reimbursed with these charges which were not wanted, agreed with or accepted but the manager at SeaTac was not interested in making a refun although they agreed to re-imburse about $200.

In the future I will be looking to rent with other hire companies other than Thrifty - or Hertz, who own them.