Invalid Debit Order

Last year I had paid my account upfront for 6 months until December 2025 meaning that my next debit order will be the 21st January. There was an issue with that payment and after multiple complaints the payment was eventually allocated. On the 31st December a debit order went off my account for an amount of R740. My last conversation with the accounts department was requesting to update my banking details. So what is that amount for? I am not in arrears and I did not upgrade my policy with you