Shocking service from Shell Baysvillage

My partner and I have recently had the misfortune of experiencing the shocking standard of customer service that Shell service stations provide to their customers. The card transaction was initially declined, after which my partner was rudely told to "pay inside" by the petrol attendant. He duly did, only to see a short while later that the transaction deducted twice from his account. Despite providing proof of the duplication by means of a bank statement, the owner and the manager both refused to acknowledge any responsibility for the duplication of the transaction or the inconvenience caused. Our family has been a customer of Shell Baysvillage in Bloemfontein since the mid '80's, but that was the last they'll ever see of us!