No assistance/Helpless

I had a credit card with African Bank which was later closed due to unpayment reason been the company I was employed by was on a wages strike which took 3months to resolved,after the wage strike was resolved I tried to make arrangements for the months prior but wasn't assisted and told make full amount owing which I couldn't afford,then my account was handed over and my salary garnished until balance owing was paid.From last month 25th October 2017 a debit has surfaced from African Bank which I went to my bank and reversed because to my knowledge I haven't authorised this transaction.This month 25th November 2017 they have debited my account twice and I have contacted them and they say I owe them R1800 this is the reason why they're debiting my account.So I say if I owe you please lets make arrangements for payments which I can afford beginning on the 25th November 2017 and refund me the 2nd debit order so I can survive,which they have totally refused.This has left me devastated,stressed and in a financial crisis.