Thrifty Rent A Car review: Car Rental Charge without full acknowledgement of charges

I rented a car for a trip to Fl. I was asked if I would want an additional $8 per day for the additional coverage, I was then charged 1071 in toal which I understood to be a deposit of $500 per week for 2 weeks. The car was paid in full thgouh priceline and I wasn't informed that by agreeing to this that I would be charged this amount and that my original contract would be dissolved.