Don’t complain
That is to say, don’t just complain.
Parties surprisingly often write long letters to the tribunal telling them all about how annoying and unreasonable the other side is being in their conduct of the case.
If you’re applying to have the other side struck out for unreasonable conduct, obviously you have to say why. But if you’re not asking the tribunal to do anything, there’s no point boring it with an account of their misdeeds.