Old linked accounts causing loss and confusion

I opened a new account today. Lovely staff and service. But it is the second time I deposited funds into an old prescribed and settled credit card. The first time it wasnt much so I chose to ignore it but this time I have deposited R800.00 and they are unable to reverse it.

This money is needed for my survival food etc as I have not been employed for an extended period now but I have started doing some work from home to survive.

Please someone advise or assist urgently. They staff told me that admin has been emailed and they expect response in maybe 2 weeks . How must I survive I have nothing as it is. Im this close to being on the street or commiting suicide. Harsh but true as these corporate giants seem ruthless and money hungry. Not really caring about the individual .

To be honest the staff at the bank were very kind and helpful but it seems their hands are bound by all the rules.

I would really apreciate if this can be sorted.