final settlement

i called in 2days ago requesting the amount that i am left to pay and was advised that i am owing R212.58 which is the final payment. I then advised that i will be making an eft and was supp**** with banking details and an email address where i could send the proof of payment. I mailed the proof of payment to [Email Removed] and asked for written acknowledgement that this was received and that this is the final payment as per my conversation with the agent as well as the invoice that was sent to me. This morning my account has been debited for the same amount and i have reversed this transaction as i have made the payment already. This morning i get an invoice that has R242.98 as an amount due how is this possible when i have paid in full. i need clarity and answers