Hi Rantsn,
The amount of promotions and credits given at the time of the sale meant that you only paid about $20 out of pocket. The full amount for the month was applied to the bill you mentioned, so this offset the difference, meaning you did not pay for the same month twice (again this is why the bill was not $180). You can see this information by clicking on My Account at the top of this page and reviewing your past invoices.
Thank you
Amanda
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