Disappointing service

Never have I been so disappointed. Waited at the till for 20 minutes if not more to get cash back from money transfer. Checked my purse didn't have my ID so asked the lady to give a few seconds to get my ID from my colleague. 15 seconds I come back she has voided the transaction. I tell her I'm back she actually looks at me tell me to wait and call the next customer right in front of me. That was so frustrating I ended up leaving without the money. It's so annoying because it feels like we are inconveniencing your staff when we ask for cashback, money transferred. Perhaps you should consider retraining your staff about this service