No way to find out, but they have to action it within 5 business days. I have raised few in the past as "technical issues", and they replied back on the 5th day. but if you processing times are within normal limits, they won't acknowledge.
Yeah, I raised a technical issue in mid-December, they replied about a week ago. I am more concerned about the documents I've submitted through web-form though last week. They haven't showed up in the my submitted documents, and I'm not sure if they're even supposed to show up when they acknowledge them