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Many companies employ non-accountants in their billing departments - when they see a figure in your account that is not zero, the automatically assume that it is a balance due - ignoring that little negative sign, or red ink.
OR - and I've seen this a lot, the company does NOT apply the credit balance automatically to pay an outstanding bill. Your account balance is a credit, but contains unpaid bills alongside your overpayment. You have to tell them each month to apply the overpayment to the new outstanding bill.
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