internet fee

Hi，how are you？

My name is Xinying ***. My att account is ***

Our internet plan supposed to be $53 per month.
But I don't know why now it's $105 on April？
We did not change any plan. Also，I put my payment as atuo pay. But I don't know if it works.

Now the internet is getting more and more expensive. I wonder why

[Edited for privacy-please do not post personal or unique information such as but not limited to full names, employee ID numbers, email addresses, phone numbers, account numbers, etc.]