Marriott Executive Apartments Downtown, Abu Dhabi

This apartment is next to the Marriott hotel. The entrance to the apartments reception is a glass door on the side of the building. There is only a small seating area, nothing grand unlike the hotels main lobby. Upon arrival, no one was there. Waited about three minutes until i saw a sign on the desk to either dial for assistance or check-in at the hotel. I decided to go to the hotel lobby instead. Went outside to find the hotel reception , i didnt realise the heat outside was too much. (I later found out there is a connecting entry between the apartment and hotel- without going outside when the concierge helped us with the luggage) During check-in, at the reception Mohamed did the standard spiel about pre-authorisation charges. I said yes. But i dont remember him clearly asking me if I wanted to pay now. I checked my bank app right away and i can see I was already charged at $1731.90 Aud.. i understood it to be i have already paid. On the check out day, this time i checked out at the apartments reception and was assisted by Gladwin. He told me my total charges , it was different from what i was charged earlier. I asked what was the extra charge for. He said from the breakfast. I told him our booking is inclusive of breakfast and should not be charged. He called the restaurant and confirmed it that no extra charges should have been made. Then he asked me to tap my card on their machine. I said i already paid. He said it was only a pre-authorisation and to complete the purchase i need to tap my card. I showed him my bank app that i was already charged. He couldnt care less and insisted i need to tap it to complete. I was hesitant but i trusted that he knows what he is doing. When i tapped , i was charged on my credit card again at $1855.23aud ( this was the erroneous charge). I blew off and demanded to speak with the manager. Mohamed came and explained that during check in he only did pre-authorisation, i said i get that.