Motozone midrand refuses to refund client

On Saturday the 23th of May 2015 I went to buy parts for my car with a samples as evidence. I was assisted by the Sales person in the name of Florah. I wanted brake pads and discs, she managed to obtain the pads and the disc, but the bearings were outstanding, she advised me to that on Monday she will try and source the bearings from elsewhere and give me a call. I then bought the pads and discs in the meantime for R1700. On Monday 25 May 2015, I got a call from her that she could not obtain the bearings, I then went back to the shop ans requested a refund and decided to get all the parts from Peugeot as they could not get them for me. She advised that I leave the receipt and the parts and she will speak to her manager for a refund. She asked that I send her my banking details for the refund on Tuesday 26 May. they refuse to refund on goods retured