Account closure and refund

Nedbank settled my DirectAxis Personal loan on 24 February 2021. On 2 March 2021, I sent an email to DirectAxis notifying them of the closure of the account. I received no reply. On 19 March 2021, my account was debited with the R1699.87 installment. On 24 March 2021, I phoned them and they advised that I had to send POP to request the closure as the debit order will continue. I sent another email requesting closure and reimbur*****t of the installment that was debited on 24 March 2021. I received an automated response to say I will be contacted in 2 working days. I have not heard from them. I tried to call 3 times today to no avail, however, if it was for a loan application they would have called me a thousand times! I need someone to respond to when I can get my money and confirmation of the account closure.