Unfair customer treatment

On 7 July 2023 I returned a Ryobi generator RG 2700 that I bought on 25 February 2023 due to the fact that starter was broken and the chock, I was told that issue will be resolved within 21 days which was fine with me. After seeing that days were going by with no one informing me of any progress, I went to the shop to found out what was happening, after a very long wait I was told by a lady called Jabu that there is a quotation on my item which she wasn't sure how much promised that someone will call me to clarify. No one called me until 16 August 2023 when an unprofessional guy by the name of Sboh called, I made it clear that due to length of time I have since suffered in such an extent that I have bought myself other generator so I no longer in need for that one, which he said he is going to speak to his manager. A guy by the name of Lucal called today on 24 August 2023 and he said the shop is not liable for any costs and further acknowledges the fact that the shop is at fault for not contacting me in due course yet insisted that shop is not liable for inconvenience coursed. I need the shop to be liable for delays and pay such damages to their supplier since I have no contract with their supplier but they are or refund me.