Novotel review: Incorrect charges to my credit card

I booked a room at Novotel West, Hammersmith for a new employee on 11th June for accommodation 24th June until 27th June, it looked like I had gone directly to the Novotel central reservations so I did not question, I was told the room charge of £129 per night and accepted this when I saw the charge against my credit card I challenged the hotel who informed me I had booked through a third party. This was news to me, when I requested an invoice the hotel told me the charge for the room was £606.90 however my credit card has been charged £939.64. This is a charge of £329.74 just for booking the room. The reference on my statement is CCI HOTEL RES [protected] US TX 75234 When I try to contact the number is no longer in service. I cannot claim this back from my company without a full vat receipt. Please advise