Hello, I know this is such an old post but I find myself in the same situation and I'm hoping you can provide some insight or tell your experience. How did it go with your request? Was there a way you rectified the communication issue with ICE? I hope they eventually gave you what you needed.
My husband sent a FOIA to ICE about 8 months ago by mail. We know it was received by the office but they never acknowledged or gave us a tracking number. I asked our lawyer if he could resend it by another means (electronically) but he advised against it saying a duplicate can cause problems and is instead just emailing them a lot. Don't know whether to listen to him or resend. I just can't help thinking they're not going to respond because our unopened packet is sitting under a pile of papers!