Invoice Paid Twice and not refunded

We paid our internet invoice regularly in November 2023. After cancelling the service in March, this one came as pending and ATT invoiced again in April.

Since I did not cancelled autopay on time, it was collected from credit card.

Credit card company confirmed November payment was successfully.

I have not success calling 800 -321-200 or emailing them the payment evidence. Every people I talked provides a different answer with no solution