Homechoice is a bad choice

I have asked for a settlement amount due to demanding debt collectors phoning me before my payment due date. I was given 3 different settlement amounts during one phone call and later decided to pay the one that was the highest as I do not wish to owe Homechoice a cent. I then continued asking if they can please close my account to which the response were that they are unable to close my account. I wanted an explanation, but I was not given a valid reason for Homechoice not being able to close my account. I accepted and ended the call as I needed to get back to work. Now all of a sudden I am being a sent an sms thanking me for the payment but now I have a balance of 27c!!! How in the world can I have a balance of 27c when I paid the settlement amount in full even before the due date? I think this is their way of keeping my account open after I specifically requested for this account to be closed.