For some reason I couldn't login to our USCIS case status online account since May until this very moment, tried to call them but to no avail .
Now this is what it states on the Case Status Online"
On September 18, 2018, we cancelled the interview scheduled for your Form I-485, Application to Register Permanent Residence or Adjust Status, Receipt Number******. We will notify you by mail if the appointment is rescheduled, a decision is made, or if the office needs something from you. If you move, go to www.uscis.gov/addresschange to give us your new mailing address.
We didn't even know that we were scheduled for interview September 18 since we haven't received notice from the USCIS.
Good luck for your interview. Take Care and God Bless!!!
Martin & Rona