Bass keeps insisting I need to submit more sick leave than I actually took

I haven’t been feeling too hot this entire week, basically. Essentially everyone is off on leave for the long weekend except one dude who’s technically my superior.

I was feeling pretty shit Tuesday so I said I’ll be working online. Won’t go into details as potentially identifiable but it’s something you probably don’t want to be in the office for. Wednesdays are always WFH. Then Thursday & Friday I felt so shit I couldn’t drag myself out of bed. I submitted sick leave for Thursday & Friday, and notified the other person on working on Tuesday that I was unwell and would work from home, as my boss is also on leave. I also notified him of my leave on Thursday and Friday. No contact on Wednesday as it is expected, as previously mentioned.

I got an email on Friday advising that my leave request was declined because I didn’t submit leave for the full period of absence. I followed up via Slack directly with my boss (again, also on leave) to reiterate that I was only off work for 2 days, and worked remote the other 2, figuring something may have got lost in the chain of escalation. He said I need to submit proof of the work I’ve done on those 2 days. I pointed him to a weekly report I write up mid-week regarding my progress. He continued to insist that I need to revise my leave application to submit leave for the whole week as I “didn’t maintain consistent contact throughout the days I was working remotely”.

I need to stress: everyone else is on leave. The 2 days I was working, no one contacted me directly. In fact, I rarely get contacted directly as my work is effectively solo. The only contact I received was being CC’d in an email chains that vaguely related to my position from other departments.

I know I should raise this with HR, but I’m not even sure how to. How do you word the request in such a way as to not sound like you’re trying to commit some sort of time theft. I’m not sure that “maintaining consistent contact” even counts as a measure of productivity, especially when I’m generally not contacted. What would you do here?