Worst experience ever from Hi-fi Corporation

I am having the worst experience with Hi-Fi Corporation in East Gate. I bought a phone from them about over month ago. The phone stop charging a week later. I took the phone to them for fixing. And I was told that it would take 15-21 days. A month later after the back and forth, and me complaining about the turn around time, they sent me a response from thier supplier Samsung that I will be charged because the phone was demaged by me, this is a month of not having a phone, which I bought for work purposes. And mind you I even took thier insurance. They say that I have to pay R150 for courier and R250 for rejecting the quote. I am very disappointed and dissatisfied by the service of Hi-fi Corporation because firstly they given me a run around for a jk month without a phone. Secondly they did not feel the need to disclose this important information of the costs involved and what I will be liable for. I never signed any agreement with thier supplier or repair partner. Their service is not in line with Treating Customers Fairly guidelines and I regret ever buying a phone from them. I am now stranded without a phone for my work and they are expecting me to come up with this money out of the blue, so that it can take another month for my phone to be fixed by thier insurance.