NWT VRGGRL strapless dress

NWT brand new dress! Bought this and it does not fit and I can’t return it. Dress details: VRG GRL — SAINT MALO LINEN MIDI DRESS TROPIC Size: AU 16, US 12 Exclusive in-house print 100% Linen 100% Rayon lined Gel tape at bust Lined gathered bust Side pockets Side zip opening Runs small, we recommend ordering the next size up Length 118cm / 46.5in (taken from a size AU 8 bust to hem) Cold Hand Wash / Cool Iron On Reverse