Poor feedback & misleading promotion

On 10th November I booked a flight with Qatarfrom London to Durban and payment was input for my credit card. On the morning of 11th I get an email saying my credit card was not recognised and I must respond before 23:59 on the day of booking (Travel back in time does not work!!). I called and the agent checked my credit card and said there was no problem but the flight cost would now be R4500 extra as payment was being made the following day. I told her to hold the booking while I checked and then sent an email to cancel the booking.<br> <br> I checked again on their website and suddenly all flights for Qatar had disappeared - while they have a competition to upgrade from economy to business for Qatar bookings.<br> <br> My daughter has since got bookings from the flights from another website so there are still seats available around those times.<br> <br> I have used them before with no problems but find their service very slow and their promotion misleading of they do not put any Qatar flights forward when inquiring.