I called my boss to let them know I'd go straight home without returning to the office.
Literal
Company [to-に] return-not-[classical-ず] go-straight-home do [nominalizer-こと] [object-を] boss [to-に] phone [by-で] conveyed.
直帰 ('going straight home') is a work-culture term for heading home directly from an off-site appointment without returning to the office first. ~ず is the classical negative connective (modern: ~ないで), giving a slightly crisper written feel. The sentence models standard workplace communication about schedule changes.