Cash Crusaders – Need help to get my refund

Hi, I bought a laptop at Cash Crusader's of which I am not expose the store but it's located in Johannesburg on the 26 when I got to my place I connected to 5G rain router so it just kept shutting down every time I tried to connect it which is frustrating, I then complained to my sister she offered to give me a laptop, so the next day on 27 I returned laptop of which the store has taken back and I've not received my refund yet, they confirmed everything as whether not tempered with on laptop, they gave me a Whatsapp number of which they never responded to my messages so I had to go in the 9 of June Sunday, they told me that I have to wait as the store didn't approve my refund and that they had found a buyer whom will buy laptop on fought night and they will transfer the money to me, I smell fraud the lady couldn't look in my eyes she kept talking didn't mainten eye contact and I have a video to prove her words and action please help me get my refund