settled my account but still receiving statement

a consultant call me and told me that my name has been handed to legal department and for my surprise i ask why they told me that i have not been paying my account for 3 month as for my surprise i ask why because you debt my account so she told me that they have not beaning debiting i ask why she told me that she don't know i ask her to arranged the debt order to go through on the 20 which she told me she did only to find out that nothing has been done i received a statement with a high billed i called and the consultant she was not friendly and i ask her why my account has not been debited and she says i don't know and she told me that you as a customer you suppose to call us and check every month so i decided to settle the account on June i call the call center and ask how much is my balance if i want to settle the account and close my account which the consultant told me that it R1993 which i made an arrangement for debit order to run on the 21 which it did 21/06/2015 Received Payment R -1,993.00 but i'm still receiving statement and i have settle the account and ask them to close my account when i call they says that the'll sort it out until today nothing has been done