New World Menlyn sold me a faulty Music system and don't want to refund me instead they are forcing me to take another system of which I did three times and still find faults.

On 24/11/2017 I bought a new JVC music system worth R8300 @ New World Menlyn and after few days after I connected the machine,I found that the receiver was faulty so I returned it to the store on 30/11/2017 and told them that I want a new one.After a long argument with the store Management they insisted on exchanging only the receiver and I agreed to it as I needed a music system for my family so that they can enjoy the festive holidays.So I asked them to check that reciever that they are giving me if that one was fine but when they checked it we found that it was also faulty.Then I told them that I lost faith on that music system as both recievers they gave me were all faulty .But still they insisted on giving me a third one so that one when they tested it in the store it seemed fine so they said I must take that one.So I agreed to that it but I told them should it also give me problems I also going to bring it back and this time for a full refund and I took it home.So after few days the same reciever had started with the same problems as the other two.Then phoned the store and they told that I need to bring the item back to the store and that was on the 12/12/2017 .So on the same day I took the whole item back to the store and when I got the they told me that they are going to have the supplier to check the product and they will phone me the next day and I told them that I now want my full refund because clearly there are quality issues with the item but they again insisted on phoning me the next day.And no one phoned me until I went a gain to the store after couple of days and still those guys still did not want to give my money back and asked me to take the forth one and I said no i don't want another one and I also don't want to make busines with them as they make promises that they don't keep and every time I go to their store to complain about the whole issue they become very rude to me.So again the said they wil phone me tomorrow as they need to phone their bosses so that they can make a decision , but up until today no one came back to me with any feedback and now Christmas have past and my family still does not have a music system but I paid R8300 for something that I don't have now.I just need my money back and will go buy another music system from another store that knows the value of their customer and I will never but anything again from that store ever.