I was double charged for my fuel

We filled up fuel on Tuesday the 2nd of February and an sms from my bank accounting for this purchased was received. Saturday the 6th I receive another sms from my bank from the bank for the same transaction but not the transaction is spilt into 2 amounts. I am very upset about this. According to my bank there has been a double charge from the BP bank and that they are known for such. How can they let such happen and if it's a known issue why has it not been fixed and what about the poor ******** people who do not see this double charge?? this is not on, something needs to be done.