Debit order exceeds amount on invoice

I have been an MTN customer for many years and generally I am quite happy with the service I received from the company. So I hope that the issue that I am raising will be dealt with promptly to ensure that I remain a happy customer.

On 17 January 2023 I received an invoice via email for R1289 which is the correct amount. However, on 31 January 2023 my account was debited by R1649.15

I would appreciate it if someone from the MTN accounts department could contact me to explain the discrepancy and rectify mistake.