I would like to know why my bill was manipulated to cause an overage fee.

Question

Halfway through my previous billing cycle, I reduced my data plan from 3GB shared between me and my girlfriend to 2GB shared, so they pro-rated the next bill, showing it to be around $30 cheaper than it would otherwise be. Fast forward to today, I go to check my bill and see that I've incurred a $15 usage fee. However, when I go look at the Usage breakdown, I see the following:
It clearly shows that the billing cycle started on May 20th, and that I made the change to go down to 2GB on the 30th. They decided to set my usage allowance for that period to 1.06400GB even though I'd already used 1.37900GB, leaving a .31800GB overage. Now, of course it shows that from May 31st through June 19th, I was allowed 1.29000GB and used 1.21100GB, clearly showing that even if it were split properly, I'd still be over.....except for the fact that I have text alerts set to notify me when I'm at 50%, 75%, and 90% usage so I can decide when to stop and avoid an overage fee.
They seemingly, intentionally, manipulated the numbers in such a way as to get $15 more out of me that they otherwise wouldn't get because they knew I'd stop using data before an overage occurred.
I am fully aware that $15 isn't a big deal. However, the fact that they apparently manipulated the numbers in such a way as to force an overage fee upon me is just plain wrong and it makes me very angry. The best part about this is that when you add up the 1.06400GB allowance of the first portion and the 1.29000GB of the second portion, that only totals 2.354GB, not the 3GB that the plan originally was. I had chosen to have the changes apply at the beginning of the next billing cycle, so there is no reason for me to have been shorted the 0.646GB of data, much less to have incurred an overage fee.
Is this sort of thing common? Is it a glitch in the system, or was someone manually making these changes with malicious intent? More importantly, can or will they do anything to fix this?Verizon Wireless Customer Support

Answer 1

See, the problem is you're both ignoring two facts.
#1 - of the two options when changing the plan, I chose to have the changes not apply until the beginning of the next billing cycle. There never should have been the possibility of an overage as there should have been no prorating when I chose to have no changes until next billing cycle. The plan I was on was a 3GB plan, I had only used a total of 2.59GB. Again, that's aside from the fact that there shouldn't have been a prorating to begin with as I chose to have the new plan not apply until the next billing cycle.
#2 - The total allowance between the two pieces of prorated data allowances is only 2.354GB, not the 3GB of the plan I was currently on. Yet again, I don't know how many more times I have to say this for it to be understood, I chose to have the changes not apply until the next billing cycle. This means that the plan should have never been split to begin with, let alone shorted 0.646GB of usage allowance.
I'm sorry if I'm being short with you, but this is a clear-cut case of an error in the process and I do not appreciate being told I am mistaken when you haven't even bothered to pay attention to all the details and check the math for yourself.