Extremely disappointed with the service at Truworths Fourways Mall

I am extremely disappointed with the service I received at the Truworths branch at Fourways Mall. I went to the store on Saturday at around 12:30 PM to exchange an item I had purchased previously. When the consultant tried to process the exchange, they discovered that the wrong numbers had been captured on their system. This was an error on Truworths’ side, not mine. I was then required to go through a verification process over the phone, but I could not verify the information because the incorrect numbers had been entered by the store. After spending almost an hour at the shop, I was still not given a solution. Instead, I was told that I should come back during the weekday because they could no longer assist me on a Saturday. This is extremely frustrating. Why should I have to return to the store during the week to resolve an issue caused by an error on their side? I have already wasted almost an hour of my time, and I left the store without the exchange being resolved. I expected Truworths to take responsibility for the error and find a solution instead of putting the inconvenience back on me as the customer.