Assuming the cash receipts from last quarter of $499k came...

Assuming the cash receipts from last quarter of $499k came purely from services provided last quarter, does only $893k in accounts receivable as of 1st Feb mean they have already received $908k last month from the unreceived unaudited revenue (of $1.8M unaccounted for with the $0.5M cash receipts)? This is also ignoring any previous quarters (Q1 FY2020 had a $1.16M difference between receipts and revenue) and the month of January itself. If it doesn't mean that, why is there such a large discrepancy between these figures?