Booking.com Made Me Pay For The Same Room Twice

I had a reservation at CitizenM for the night of May 10th, booked through Booking.com, and I also purchased the protection plan. Despite this, I contacted the hotel three different times and was repeatedly told that I did not have a room. Even two days before my stay, I was still being told there was no room in my name. Because of this situation and the lack of confirmation, I was forced to book myself again for the same night, at a cost of 211.00 for the room. I am now in a position where I am effectively paying for this night twice, even though I did everything correctly and had protection in place. I am requesting that the duplicate charge for this stay be refunded and that I am not made to pay for the same room twice. I would like this to be reviewed urgently and the appropriate refund processed.