Refusal to refund me, forcing me to take a gift card

I went to Woolworths Festival Mall yesterday (17 Aug 17) to return boots that I bought at East Gate but Festival Mall has my till slip as I had bought a lot of stuff at EG but returned a dress at Festival Mall but they never gave me a copy of the till sleep.

I got a call from someone at Woolworths asking me to rate the service and I explained my situation to her and she advised that I should go instore and explain to them that Memory had assisted me with the return on the 2nd of August and they would be able to pull the slip for me.

I went and the ladies on duty said Memory was off and she was the only one who would be able to assist me. They said they do not keep the slips on site so I should wait for them to go look for the slip in their office. This was upsetting to me because I don't want to wait if I want to return something or drive back and forth for something so simple. They then forced me to take a gift card instead because they said they won't find the slip.

I am upset because Woolworth is a brand I prefer but the way their staff behaved or maybe the procedures are not in line with my consumer rights. All I wanted was my till slip or refund. I left with none, I felt disrespected and uncared for as a customer. I should sit and wait for a call till they find the till slip then they will call me. Who will cover my costs of going back and forth to Woolworths and the time I am wasting to sort this out.

Can someone please assist store an idea of how to process a refund or how to find till slips. I learn't a lesson to always request a copy of my slip like I am dealing with a small store in the corner.

All I want is my cash back.