Unauthorized Debit Order

In July 2021 takealot tried to debit R690 from my business account and it was returned because there were insufficient funds and my bank charged R130. August 2021 early, there was money deposited into my account and immediately takealot debited my account with R1035. I immediately reversed it and to my surprise the money was not reversed. I went to the bank and they said that they can see that I tried to reverse it but they did understand why it did not reverse. I NEVER GAVE TAKEALOT AUTHORITY TO DEBIT MY ACCOUNT AND I DID NOT DO SO CALLED SELLER PORTAL WITH TAKEALOT. Can someone from takealot call me and explain to why will I just want to donate so much money without doing any business with them? I can't use my business account now because I am afraid what they can do because they started with R690 now R1035. And I tried to contact takealot and even my bank has but no one wants to come back to me. Takealot is a big company to be doing this. If they can take money without my consent what will they do next????????