Debit order after full amount settled.

I am a long standing client of African Bank. But I am really disappointed in the latest development. In order to cope during this challenging time, I opted to consolidate all my loans via a Nedbank personal loan. This included full payment of my African bank loan which was paid directly from Nedbank to African Bank 29.06.2020. I am a transunion client and was satisfied when I noted that African bank had updated my status as early termination (T) . No further deductions were taken off my bank account by African Bank (I had a debit order). However today, 27.08.2020 African bank deducts R3851.78 from my bank account without warning or explanation. This effectively leaves me with no food money for the month. As a single mom of 3 this is devastating. I have NO missed payments on my ITC, but due to this massive unexpected debit order I will now have payments bouncing and my credit record affected. I especially consolidated my accounts to reduce payments. How is it possible that after 2 months, African bank suddenly debits my account again? Can someone URGENTLY resolve this matter please.