I bought a cellphone around January and I was using it till March 27

I bought a cellphone around January and I was using it till March 27. On 27 March around 20:00 my cellphone just went blank while I was using it. I tried to put it on charger thinking maybe the battery was low. It slept on the charger the whole night. Then on the following day I took it back to the store and they booked for repairs. I left a contract number were they can contact me when it came back. On 16 May I when to the store just to check my cellphone likely when I got there it had arrived. I took the phone and they didn't say anything just gave me the cellphone. When I got home I found the cellphone still not working. When I read the comments from the repairs it says that Comments: mainboard and tape I went back to the store they told me to take it to Telkom store. And I currently don't have money to go to the Mall