Billing discrepancy

user_3hk8on, Thank you for reaching out to Xfinity Support with your question about your bill. Keep in mind that we bill 30 days in advance. If your bill reflected a higher price after your promotion had expired, it will take a billing cycle for you to see the new promotional price on your bill. Anything you overpay this month will be prorated on your next bill. In other words, it is all going to balance out by your next billing cycle.