Settled account but still show amount due for more than 2 months

I settled my account about 2 months ago. I even received a settlement letter. But I still have an amount due every month. I have contacted Homechoice a few times to correct this, but for two months + there is still no change on my account. My amount due is still not reflecting R0. I made phone calls, I have send emails...I was only promised that it will be sorted or even that it is. But as to date..my account still show an total due. I don't want to close my account at Homechoice I just want it settled as per the payment I made and settlement letter I have. I want my account to show R0 (as settled)