looking for paid-up letter and itc clearance

i had a Telkom sim card i asked for asked for the a outstanding balance and they told me how much it is; it was R1409.81, then we agreed on paying with three months instalment of R469.99, they took all the money once which was R1409.81 and they continued debiting more on the month of May they debited R696.74. On the month of June, the debit another R920.56.On the month of august they debit another 1366.30.