Double Billings after service was suspended

I would like to query my account statement the whole month of October I did not have access to internet due to non paymentof that month and on the 25th of October my account was debited twice. When I upgraded to 5G you promoted a 1 month free access but this was not credited to my account and again after debiting my account twice last month I see an invoice for another R499 due on the 31st of November regardless of having contacted your call center two weeks back and sending countless emails to get this rectified. Can someone from your accounts department please contact me to clarify