Unauthorized Manual Debit Orders

I have been unemployed since Feb 2017. All my accounts have gone into arrears and i have been handed over for debt collection. I have received UIF but have mostly re**** on people to keep a roof over my head and food for my 3 kids. Nedbank Credit Card Division, after requesting that they hand me over, Manually Debit my account the minute people put money into my account so that i can try and pay rent and feed my kids. I have been employed now for 2 months - but the Salary does not cover my basic expenses. For 2 months now, Nedbank Credit Card, simply Manually debit my account the minute funds are transferred to assist me. I have requested over and over again that they hand me over to the Attorneys where i can make an affordable arrangement as they are not willing to accept my minimum payment. Funds put into my account by friends and family are there to assist as i am struggling to make ends meet. Nedbank refuse to reverse the amounts taken - are these Manual unauthorized debit orders even legal if i have not signed and approved them?