Billing errors for last three months not fixed

Hi,

I have home duplication errors that occurred because the contract was not applied properly, according to one CSR I spoke to.

I have called on numerous times trying to fix this error, but no one seems to know what is going one and no one helps.

I called the sales person and he pointed out the billing errors in less than 5 minutes, but he said he could not help further as he was sales, not billing.

Who do I contact now?  Is there an email for a business billing supervisor I can contact?