A slight delay in getting your referee reports for that article? Try the following approach. First, accuse the editors with something like:

Such behavior is a violation of my scientific work as an author. It is most uncollegial and inexcusable.

Rant on for a while … and then close with:

If you do not wish or are unable to deal with this matter forthwith, I shall be forced to pursue legal procedures.

Such genteel behaviour will guarantee you favourable referee reports.