Account settlement

I settled my account on the 19 June. On the 22 June I received a letter stating I settled account in full from the head office. I checked my credit profile, the furniture store did an enquiry on me without my knowledge. Also, I visited the branch to check if my account is cleared and tegu state I have an outstanding balance. I do not understand what the balance is for. I have called head office an been transferred to several people, but without any help. Please help with this because it's affecting my credit profile negatively.