Pathetic customer service at south gate mall

I went to woolworths at south gate mall on Monday to exchange the slippers size that I had bought, first their customer service section was closed, I was told to join any queue in the store. Keeping in mind of the sale that is running in the stores. I had to wait in the queue for over 20min then when my turn came the lady who was helping was so relaxed sitting down, not that I expect her to be standing all the time but the attitude is so disgusting. It was a simple exchange as I was just exchanging the size. She calmly said to me the supervisor is not around and I must wait for her to come back and she jut sat back, I then said to her is that all you going to do, you not going to look for her, call her or announce for her, she said to me we don't have anything to announce for the staff and we will just have to wait, I said to her can you see how long this queue is and don't you think this people are tired as its only two tills open, she said OHHH WELL THEY MUST WAIT THERE IS NOTHING THAT I CAN DO. Giving me a pathetic attitude, it took me more than thirty minutes just to exchange a shoe size. As a healthcare work I spend my whole day standing and I can not by any given time help patients siting down, being as tired as I was, having to stand in a long queue and being told to way for someone to do their job is making me sick to my stomach. I have never experienced such disrespect at a woolthworths stores like this, especially being a a regular customer.