Who's actual fault is it that my money's been ******.

Really disappointed with the service, I got with hertz recently.. In fact I'm shocked by their arrogance and disregard for my hard earned money. Long story short, I had booked a car till the 29th of June, and had paid upfront, they then logged it as a booking till the 28th, even though I had paid till the 29th. When I extended the car till the 2nd July, they then recharged me for the 29th. So I had paid double for 1 day. When I went to complain about this, I was told it's every other person's problem and fault except there's... No interest in helping me resolve the issue... Just a simple reply of "well that's how it goes" Their reply was well your booking agent booked and charged you for tthe 29th, we only have you till the 28th, so it's not our problem, you must just accept it and move on... Also you deposit you paid, we'll give that back in 2 weeks time? Why must I wait 2 weeks to get my money back? Surely it's sitting in a account safe somewhere? ****, I mean you're quiet happy to pull money straight out of my account at a moments notice, but when I want what's mine... Oh hell, now it's a whole process!!