Website not up to standard

So I went onto the Avis website to make a car rental booking.I put in all my details and pay for the booking.Money out of my account but no booking confirmation on email not sms.I call the call centre and they tell that the booking is not processed and that the car I was trying to reserve is not available.So how do my money gets deducted from my account when the booking is not processed?How the hell does that happen? I didn't even get a notification alerting me the car ain't available.I urgently need to make that resevation as I'm gonna need that car in two days time.With what money am I gonna do it? The resevations consultant tells me she can't process another booking without deducting another funds from my account when money is already out of my account.Apparently they need to reverse those funds.When will that be and what am I supposed to do in the mean time?I'm so bored!