Over charging for diesel at Caltex Cedar Ave

Went to top up my car with diesel tonight at Caltex on Cedar ave. They are selling diesel at R24.10 per liter. The current price according to the AA's website (before tonights price increase) is R22.15. How are they charging almost R2 more per liter for diesel but their price of 93 & 95 petrol is exactly according to the AA's website? (They also apparently didn't have anymore petrol when I was there and were turning people away) Am I missing something?