Billing department *********** and disappointing

On the 22nd of November i paid for my Cellphone contract bill online on their Telkom mobile site the amount of R655.20, on 30th November they debited my account the same amount (R655.20) of which i understand their system magtape was already registered. I called them to ask if they will refund me and they said i can reverse the amount on my side of which i did.

On the 6th of Dec they tried to debit my account with the same amount again and went on to suspend my account, i called in to find out what was happening and they told me they will investigate. 1st January i still owe them R655.20 which seems to never go away even when i have made payment long ago before even the due date. Today my account is suspended and i now owe the unppaid cheque charges + R655.20. Telkom Billing and Accounts why do you do this to your loyal customers?