Sorry but you can't do anything but wait for your rescheduled interview. There's a delay just like the clerk said so they will notify you or your lawyer ( if you have one) threw mail on your next AOS interview it happened to my mom she is now a green card holder.
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Initial DACA Applicant-Date delivered: 9/04/2014 (Nebraska Service Center) Biometric Walk-In: 9/26/2014 Case transferred to (California Service Center): 10/?/2014
I-821D (12/18/2014 APPROVED!!!)/I-765 (12/18/2014 APPROVED!!!) Approval Letters received (12/23/2014) EAD Card received (12/29/2014)