Refused a new laptop/refund for damage I don’t know about

I purchased a laptop at HiFi Corp on the 12th of March 2024 ,it was working fine until it stopped working on the 29th of January 2025,took it in for repairs same day the agent checked it and saw that the power goes on and laptop charges however the screen stays blank,they told me it’ll take 14-21 days for it to be fixed ,I call in each week to check if they done of which I was told no every time only for them to come back to me over a month later to tell me that the laptop is water damaged ,when I asked them how they told there is nothing they can do and they won’t be replacing or refunding me since it is water damaged !which I don’t understand why they kept it for so long without any updates ,I definitely did not damage it by water ! Brought it in with a blank screen but everything else was working , one of the agents escalated it and they still said they won’t replace my laptop . It took me so much time for me to save up for a brand new laptop and I use it for work , as a single mother this is very painful and inconvenient in every way,how do I now just lose R7000 just like that ? This laptop is only a year since I bought it and now as it stands I don’t have a laptop anymore because of people that refuse to do their jobs effectively,over a month since they had my laptop how do I know they are the ones that damaged it ? Please help ! I don’t have R7k to buy a new laptop.