Bad customer service

I received a 10% birthday voucher from Woolworths. This app**** for homeware,clothing and beauty. I wanted to buy a couple of items including foods over lunchtime. I already gave the voucher to the cashier (Antoinette) before she started processing the sale. She scanned all the items and then realised that she could not process the voucher for my \mixed bag". She had to scan the foods separately. (She also miss- scanned one item which the supervisor detected.) After rescanning everything"