Refund Of purchase

I phoned the shop before I went to purchase a UPS from them, firstly they did not have a 1200va/600w , but instead offer me the 1000va/600w, I ask the man if it will do the same job as the 1200va, and he said yes, if not I can return in for full refund of my money. How ever on arrival back at my business I discovered that the cables that you plug into the UPS is completely different from what it use to be, I phoned Matrix and explained to them what the problem is and I want to return it for refund, the man said yes it is fine I can come. Went to the shop just to be told that sorry we do not have the cash to give to me now but they will transfer it to my bank account on Monday 5 December 2022. At 12h00 still no money was transferred to my account, phoned them , they did not know about the transfer but it will take a week before i will receive my money back, I got very upset and ask for the owners number, the lady refuse to give me the number, she said i must wait till they have the cash then they will phone me to come and collect it, this is not expectable, as I paid them hard cash, they did not had to wait a week for the money, they got it on the spot, now i must wait till they have cash in the shop before i can get my money back, the staff in this shop is very unprofessional, not trained for working with clients or how the products work that they selling. I'm not a difficult client, as I know how clients can be, but to be told I have to wait for my money till they have enough in the shop to pay me back.......this is not expectable. I will think twice to do any business with Matrix again, and will not recommend that any one support them.