Got charged for a month that i had no subscription

Hi there,
i was wondering if i or rogers are at fault for this dilemma; i had an overdue bill payment and on november first they disconnected my phone line and i was out of the country. I was unaware my payment didnt go through so i came back to canada on december 12, still with no phone (disconnected), so i payed the bill but on my rogers bill summary, they had charged me full for the month of nov.6 to dec. 6 when i had no phone. i paid it without realizing that and now i am wondering i they were right to charge me for a month in which i had no subscription.