Dissatisfied service

I'm very unhappy with the service I have been getting from my bank. I went to BP northdene and made a purchase the transaction showed it did not go through twice and came up with an error code and thereafter I paid cash. As I walked to my car I have seen that the transaction went off twice from my account and went back inside to advise and was told the funds would reflect back between 24 to 48 hours it's been almost a week and still nothing has reflected. Paying 3 times for one transaction is completely unacceptable. Please urgently resolve this issue and I wish to be reimbursed for my time, effort and money that has been spent with the time to try and resolve an issue that should have been sorted out urgently. Please contact me on ***. Very unhappy client!