Beware, do not give Air France your credit card details!

On 14th July I booked a business class ticket from Johannesburg via Paris to Munich. The payment process failed because the credit card details they had for me were outdated. Though I immediately updated my credit card details and made the payment, which has gone off my account and was confirmed by my bank, Air France insists that the air fare is outstanding and asks me to pay it again. And it seems they are also asking for a higher air fare now. My wife is on the same outgoing flight but returns on a different date and therefore we booked separately though at the same time so as to ensure we can reserve seats next to each other. Her air fare changed from the time she selected the flight to actual payment, which took a few minutes only, from R39.923,40 to over R45.000. I have spent more than an hour on eight phone calls to the Air France call centre where you struggle with agents who struggle to converse in English. I completed a survey expressing my disappointment, wrote an e-mail to Air France's customer care e-mail address and am worried that I will lose my flight booking unless I pay the air fare a second time and then struggle some more to get my money back. Clearly no supervision. It is a shambles.