Awful experience. Would not recommend staying here...

Awful experience. Would not recommend staying here to anyone. My grandma booked us a room for a night in Brisbane this past weekend. I flew in earlier than her so I got to the hotel first. My arrival was noted on the booking so they were happy for me to check in and pay what they told me at least 3 times was a $100 deposit. It turned out to be $550. I was completely mislead about the amount they were taking, I assumed they just charged the room to me at the same time of taking the deposit (the room was $450) even though I did not authorise it. I then check my everyday account this morning to find that it's overdrawn as they've charged $450 to my card. So I called and they have said that the $550 was a deposit that will be returned within 7 days (so why wasn't it said to me explicitly that $550 would be taken off my card? On my life, $100 was what was said directly to me as she took my card!) and the $450 is the payment for the room, which I never consented to. This charge wasn't said to me when I checked in and asked 'So only the deposit comes off my card right? The room is booked on my grandma's card?' I was told 'Yes, the room will be charged to the card that made the online booking'. When I brought this up on the call I was told that this is what happens, online bookings will be charged to the card that made the online booking, when I said 'Well my card wasn't the one on the online booking, my grandma booked the room,' the person had nothing to say. No apology for taking a payment with absolutely no authorisation from me. They're calling head office to get the $550 deposit released to me hopefully today instead of waiting a further 5 days. To summarise, they misled me about the deposit, took the room fee from the card that did not make the booking without any authorisation with no apology, or any suggestion of compensation for the overdraft fees I now have to pay due to their negligence. I will never consider staying at Sofitel again.