Standard bank Home Loan don't want to refund me my money on their mistakes

<p> </p> <p>I contacted standard Bank and explain to them that am going to make payment manually for this month and I transferred R3300 to my account and the person that I was speaking with agree and she said she saw other money is already reflecting and debit order will not go out of my account, Guess what it went out of my account, ok no problem now I contacted standard bank daily I keep on holding no wants to assist me they are sending me from pillar to post when I need my refund, the last person that I spoke to was Fumane makarimge reference number ********** 7,yes she was very friendly but the main concern is I want my money,it need to be used on Tuesday(05/10/2017),she requested me to write a letter and email them am still waiting for their respond.</p>