Defective Phone

I bought an A Core 2 Samsung phone at the Goldfields Hi Store in Welkom. I bought it on 07/09/2020. This phone has been in and out of repairs for four times. In a period of 6 months I have only used the phone for 10 weeks intermittently. I have asked for the phone to be replaced but it has not. It went in for repairs on 21/09/2020 to 04/10/2020. It went in again on 23/10/2020 to 04/11/2020. It went again for repairs on 23/11/2020 up to 09/01/2021. It has gone again from 12/02/2021 to date. I think this has become clear that there is a serious malfunction of the phone. I do not want it anymore but Samsung together with the Hi Shop at the Goldfields are not going ahead to replace the phone or reimburse me.