Bill is not prorated on my end (only Xfinity's end) - Unable to pay prorated amount

I canceled my internet services 2 days into this past billing period and subsequently returned all of my equipment. When speaking with an Xfinity representative, it was agreed that my next bill would be prorated (for 2 out of the 30/31 days). Over the next month, my bill showed a balance of $70.00, and I continued to wait until the amount changed to the prorated amount. It did not, and I contacted Xfinity where they confirmed that my owed amount is $2.26. However, I do not see this amount anywhere and can only see the $70. When I expressed concern over the fact that my page was not showing the $2.26 at all, and only the $70, the rep refused to listen to my concerns and just told me that I did not owe $70 and to pay the $2.26 to close out my bill. Not shockingly, attempting to pay the $2.26 against the $70 that was shown to be owed did not work as the payment was not processed. I'm more than happy to pay the final $2.26 for my bill, but I need to find a representative who understands that I am not seeing the same amount on my end as they are on theirs.