Woolworths cannot void a sale

I need to understand why Woolworths cannot void a sale??It has taken 5 days and counting and still unresolved. Numerous calls back and forth, and now I have to go back to the store, because they cannot void the sale, without me being there in person, to do the security verification....not with someone in the store, but over the phone. How does this make sense Woolworths? And are you charging me finance charges for goods that I do not have, for a transaction that should have been voided? How in this day and age, can such a big company have such a laborious process for something so simple? Or am I giving your company too much credit (absolutely NO pun intended)!! The second star is only due to the fact the staff at the store called me back when they said they would, even though there was no progress!