prelaid balance disappeared for received calls

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Terms of service

4. Payment and Cancellation. You must make a payment to your account within 26 days of activation, or your account will be canceled. AT&T PREPAID cards and other account payments are nontransferable and nonrefundable. The *888* command for payment only works with PINS/Cards purchased from AT&T-owned retail stores and select authorized retail locations and may not work on all device types. Amounts deposited into your account expire in accordance with the stated payment denomination expiration period ($10-$24 payments expire in 30 days, $25 to $99 in 90 days, $100 or more in 365 days). Unused account balance forfeited upon expiration. If you are on a monthly plan, the applicable plan charge for each renewal period will automatically be deducted from your account balance at the end of the day (11:59pm Central Time) on your plan's payment due date. Applicable plan charge for any AT&T PREPAID plan is not refundable and not exchangeable, and any unused services of your plan are forfeited if you change to another plan during your plan's period. If your account balance is insufficient to pay the applicable plan charge, you will not be able to use your plan services, data services, or any pay-per-use services until you make a payment to your AT&T PREPAID account with the applicable amount or your plan is renewed. AT&T PREPAID accounts for phone plans, except Emergency Phone, will be canceled 60 days after expiration. AT&T PREPAID accounts for data plans and Emergency Phone will be canceled 365 days after expiration. A new wireless phone number is required to reactivate service once account is canceled. Account balance limit is $500.

Hi, this doesn't answer my question. I am aware of what payments I made,
but nowhere can I find why I was charged $14 for a period of time when I
made zero calls and sent zero messages within the same week of renewal, and
without changing the plan type. I have the 25c /min option.

How can I find out why I was vharged $14 for a time when I only received
incoming calls, which are supposed to be free?