Standard bank is ****ming

have Prestige account which I'm no longer using it. I tried to arrange with Standard Bank to close the account while sitting at R3 000. I cancelled all the debit orders from this account. When I check in my app, no debit orders available, but surprisingly it keeps on going up, as we speak its negative R7 000, which I'm not prepared to pay hence I'm no longer working. I told them that they can increase it up to million rands and over, I'm not responsible for that. My life will go on