Unfair treatment. Consumer exploitation

I have bought my mom a washing machine Kelvinator Twin tub. I asked for delivery was told the delivery to my mom is expensive and i agreed as they share the amount. I then organise my transport to collect. All was good. 1st day my mom used the machine to wash as realise the water the machine did not work. She called me as we not staying together. I then reported it immediately to Hifi Corp Witbank. Was told the will send people to look at it. It did not happen instead few days later was told they are processing a replacement. Which I really appreciate.now the question is who will carry the cost to bring transport the machine back and collect? I have no problem in organising the transport again to bring and collect. But I requested Hifi Corp to meet me half way as this is not my fault but from their side of the product given. So was told no way. And I requested that the collect the machine and i will collect the replacement too. And also told no way and was threatened that this replacement will be cancelled. I really don't accept this as it is their fault product while it says 2 yrs warranty now 1st time use. And I must carry double cost while the Hi Corp and the Kelvinator carry no cost for their fault.