Hi there @Frankhime69!
We appreciate you reaching out to us regarding this problem. It definitely is never okay for unapproved usage on your account or services! I will be happy to help you with further details.
Did you view this usage history with your online account? You may want to suspend or block your lines in order to stop this transferring of data. Also, please take a look at this fraud support article for further details regarding the unapproved usage which took place. Keep in mind, the usage may also be viewed by any authorized user on the account. To learn how to manage authorized users, please click here.
I hope this is advantageous to your situation. Please let us know if you have any additional questions!
Shenoah, AT&T Community Specialist