Default( Bad debt written off)

Unsatisfied client I settle my standard bank credit card ********** ********** 17 some time in April 2016, it was during time of unemployment. What happen I received funds and standard bank debit me and I had arrangement to pay +/- R3500 to settle the account . Standard bank automatically debit as soon as funds came in my account and the arrangement debit went off. 1 off the payment was paid back to me and confirm my account is paid up. A month later Standard bank listed me as Bad debt written off(default).... Clearly this was not my fault they debit me twice and paid back the extra money ...now am listed they need to remove me asap.