British Airways & British Airways card issued by ABSA

I had duplicate charges on my British Airways Credit Card issued by ABSA, for British Airways flights which I booked. This was a significant amount of money, which I didn’t authorize. ABSA 1. No one time pin was inserted? 2. I was cut off 5 times in an hour, waiting for ***** department to assist me. 3. Unhelpful staff at ABSA. 4. Unable to send me a statement for the last few days as proof of the issue. 5. Declined to help in any way and told me it was British Airways problem. British Airways 1 . Acknowledged the duplication and informed me I would have to wait 7 to 10 days for the refund. 2. Unable to escalate my complaint to a higher authority. 3. Still waiting for the courtesy of a phone call.