Vacating an appellate opinion and a trial court order in a case with several improper procedural maneuvers, the Illinois Supreme Court explained that the counterclaim Professional Transportation Inc., or PTI, filed — along with a matching set of affirmative defenses — as its response to Mary Terry Carmichael’s complaint (about alleged failure to provide her with the required amount of underinsured motorist coverage) wasn’t a “true counterclaim” and should have been stricken “as …