Struggling to close account that has been paid up and to get paid up letter

The 12th of October 2018, i paid R5160, the settlement balance according to LGR Attorneys, I have the paid up letter from LGR Attorneys and submitted it to Wonga. Since then I have been calling for a paid up letter from Wonga, as the account is paid up. Everytime it is a different story from any person working at Wonga. Then one says the account is closed, then the other says there is still an outstanding amount. I have recordings of every call I have made to Wonga and that it states the account is closed from several people. I get emails from HTN attorneys that says I owe R6007 all of a sudden. Can you please rectify this PROBLEM AS SOON AS POSSIBLY, AS MY PATIENCE IS RUNNING OUT. I WANT A PAID UP LETTER IMMIDIATLY AND THE ACCOUNT MUST BE CLOSED. I Will never deal with Wonga again after this poore experience I am dealing with. Otherwise I will take it up higher and go to the ombudsman