Beware of these ********!

To whom it may concern, im truly annoyed by this company called called Norman Bissett & Associates Group, i have recently pulled my credit report and to my surprise i am flagged by Nimble group which is under Norman Bissett, according to my knowledge, they are representing Wonga short term loans, which i have settled already,these people have been threatening me with phone calls, mails entailing encrypted statements, whilst on the rehabillitation programme with debt busters,I was issued with the clearance certificate already which means wonga acknowledges the settlement of the account, i have called norman Bissetts offices to enquire about the whole issue,i was advised to send proof that the account was settled, i have then sent them my clearance certificate, however the account number the consultant said my "****" account is linked with is totally not my initial account number i had with wonga,my account with wonga was ***, but according to Nimble, i have an account which is as follows:2WO06466 and im threatened to pay R2689 and use that account as a reference,For what though??? Please remove my name from your database and alert the credit bureux about your incompetence, i dont have business with you, you are also affecting my credit score progress, fix this asap