Contact USCIS Step by Step:

Call USCIS at 800-375-5283 (M-F 8am-8pm Eastern) and then, follow the steps below:

1. Reschedule interview (even if you actually do not request reschedule interview)
2. Interview.
3. I do not have my receipt.
4. No, thank you.
5. <You will be asked if they can help with anything else>
6. Reschedule interview.
7. Interview.
8. <You will be put through>