About the charge of additional data

The $15 is for another 200MB.  If you use more than that this month, you will be charged another $15 for another additional 200MB.  This will continue until your monthly billing cycle restarts. 

The best thing for you to do now is to switch to the DataPro plan for $25, and back date it to the beginning of this billing cycle in your OLAM.  As it is now, you are spending at least $30 for at least 400 MB.  You save $5 with my suggestion, and probably won't go over again this month, based on your usage.  You can switch back to DataPlus for your next billing cycle.

@doahuang, visit http://www.att.com/shop/en/wireless/data-plans.html#fbid=HZSOQHQ0xDP for information on overage charges and available plans that may better fit your needs. Let us know if you have any questions.

so it's like ATT already charged me $30 for 400MB, right?

alright i think i'll never exceed my data limit again

btw, no matter what it's a ripoff 😞

Yes, from the wording of your first post, it sounds like you have already been billed the additional $15 for a total of 400MB.