Bad attititude

On or about 6 August 2017 I purchased an item from Truworths Woodlands, Pretoria for R499. Their system was offline and I ended up paying cash for the item. Later that night I received an sms from my bank confirming that the money was deducted from my bank account. I went back to Truworths the next day as they have now received double payment, they never cancelled the first transaction. I was informed that they require a bank statement. I provided them with the statement only to be informed that the Finance Department is the only department that can help, but they only work certain times and when they call, they are not available. All relevant documents have been faxed, according to Daniel, but still no refund or response. Truworths just has a "no care" attitude when we approach them and refuse to assist us.