Thats the problem, is that they want to issue "credits" and not refunds, meaning they get to keep your money. I have always demanded a refund from charter for any overpayment mistakes I made, and I have always gotten them(albeit, its an inconvenience to them to send me a check for $15, but that was money I could/would put elsewhere). You just have to be firm in what you want, and not take the "credit" crap.
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