I filed on July 15th. The refund was deposited in my account on August 19th. It's been more than a month. I have not received any communication from the IRS.
"Do I need to file an amended return?" Preparing an amended return would not be appropriate since you have no idea what the IRS changed. Wait until you know what happened.
To call the IRS:IRS: 800-829-1040 hours 7 AM - 7 PM local time Mon-Fri
Listen to each menu before making the selection.
First choose your language. Press 1 for English.
Then do NOT choose the first choice re: "Refund", or it will send you to an automated phone line.
Instead, press 2 for "personal income tax".
Then press 1 for "form, tax history, or payment".
Then press 3 "for all other questions."
Then press 2 "for all other questions." It should then transfer you to an agent.