T-Mobile's automatic fee deduction service AutoPay takes care of your bill every month. It didn't work as intended for some customers this month.AutoPay links your bank account or debit card to your T-Mobile account and deducts payment every month. You basically trust T-Mobile to only withdraw as much as the payment due. And while the system mostly works fine, it can glitch out, like it did this month.Per The Mobile Report, some customers were double-charged between April 10 and April 13. And since only payment would have shown up on the account, many customers might not even be aware that they were billed twice, unless they keep an eye on their bank account.T-Mobile is aware of the issue and has promised to refund the extra payment. Customers are not required to do anything for the refund. If some charges in your bank account don't add up and you suspect they are related to T-Mobile, you may be tempted to reach out, but since the company's system will have no record of the duplicate payment, the representative likely won't be able to help you.