Nedbank’s poor service

Nedbank double debited me on a personal Loan , on trying to reverse this amount that was double debited I went to the branch in Vaalmall they didn’t have the system to reverse the debit,mind you I app**** for the loan at this branch, they say I must call the call center who also told me they couldn’t help me it’s another department that can do it, and when I call today I get attitude from the consultant as and tells me I will be refunded within 3days .. these banks rob us on these interest they charge,they use our money anyhow they want to and have the nerve to treat people like rubish