Refusal to close a paid up account

In August 2018 I paid up an active account I had with Homechoice, I have been calling since then to request for the account to be closed but my requests have been ignored. The account still shows as active on all credit bureaus and to my dismay it shows that I owe them 3rand, this is ridiculous as I made full payment in August of 2018. Keeping this account open is not only affecting my credit record but also making me susceptible to getting de*****ed. Homechoise really needs to change their ********* processes.