Visitor Visa extension approved for just one day

[raoshree]

We filed Visitor Visa Extension( I-539 for category B2) on Jan 8, 2014 as my parents I-94 was expiring Feb 7, 2014.

On April 14, 2014 we received the approval notice but the extension was only approved from Feb 7 2014 to Feb 8 2014 for just one day.

We called the USCIS customer service and opened up a inquiry and i received response today and reason they gave was "Our records show that you departed the United States on February 5, 2014, prior to the end validity of your currently authorized status.  Therefore, your application will be approved from the day after your current status expires until the next day, from February 7, 2014 to February 8, 2014"

My parents have never left the country and we are not sure how they assumed that. I have taken the info pass appointment here in Phoenix 15 days from now.

Looking for advice from the experts is it advisable to wait till Infopass, how do we handle the situation are they now out of status even if its USCIS mistake assuming they left the country.