What does this mean?

I received an email from USCIS and the contents are below.
What's the meaning of this?
"On September 6, 2005, we responded to your request for more information concerning your case. If you have not received our response within 30 days from this date, please call customer service at 1-800-375-5283."

Does this mean USCIS sent out a response mail to me regarding my call for request more information about my case in the middle of Aug.?

Thanks in advance.

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