Credit Card Debit Order Problems

Usually FNB's SMS are accurate when it comes to the amount that they debit for my credit card. Last month they however double debited me resulting in two of my debit orders not going off and in me running around to sort the situation out. They however apologised and returned the money later.

This time, they sent me a SMS as usual saying that they were going to debit R2888.04 on the 1st of June for my Credit Card. To my surprise, they have now debited R4325.14 and I don't know why. This affects my budget in so many negative ways!!!!