Invalid maintenace fees

Hello, I opened an account last year with nedbank and chose a student package without maintenance fees and I was given one but at the end of the month R22 was deducted from my account without my knowledge, when I went to query, I received no help and found that there was an overdue amount that I will not own up to because it was a student account. My issue was not escalated to management even with the endless grievances.