The staff told me that I didn't pay. But I prepayd the reservation. I had proven it with the receipt, the booking details and even my PayPal account details. They didn't believe me. After two hours, calling with the manager, waiting, waiting and waiting, finally they found, as they told me, the reservation in their email spam folder. Unbelievable. For us it was already too late for our scheduled activities in the city. French people....