Going along with what PeteC2
said, you should be able to do a line by line comparison with your last bill (which as you said is $14.00 less) with your current bill (which has the $14.00 increase), and then figure out where the increase comes from.
Sure, looking at the "bottom line" there is a difference of $14.00. I know on my Comcast bill, it is broken down in the following ways.
On Page #1, is the total due, and right below that, is the high level of each service you have (Internet Service, Other Charges and Credits, Taxes and Fees, and so on), with the total amount for that given service item. Then on the back of Page #1, and onto a 2nd page (if needed) is the actual breakdown of each of these service items to show where they get the amount shown on Page #1. Adding up each service's section on Page #2 (and others if applicable), you will get the total shown on Page 1. Then, if you add up all your services on Page #1, you get the Total New Charges on Page 1. It's all simple math!
If you take the time to sit down and look at your bill, it should not be that hard to figure out what changed between the two. For all you know, you may have had multiple things change that add up to $14.00 (add a rented modem for $7, add DVR services for $3, and taxes go up $4, would total $14 as an example).
So, my suggestion would be to look at the bills, and see where the increase(s) are at. Then, we should be able to help you out to figure out why things went up.
--Brian