Bad Service from Standard Bank

On Friday 23 November 2018, I emailed the Customers Resolution Centre about a query I had. Standard Bank debited my account twice for the same debit order and did so without any authorisation from me and no notification from them. Due to them double debiting me, my other debit orders came back unpaid due to there not being enough funds in my account. I get charged a fee by Standard Bank for every debit order that came back unpaid, but yet it is their fault. I contacted them and asked them why this happened and could not be given any answers. They said they will get back to me in 24 working hours. It has been 40 working hours and still no response. I want Standard Bank to give me back my money as well as refunding the money they took from me for the unpaid items, because that was their mistake, not mine!