Unfair treatment

I bought a premio phone at ackermans last year the phone gave me problem of freezing.now the phone is not switching on i took it to the shop on the 27th jan 2020 was told ill b called whn it back to my suprise was not called till i called just to follow up n the phone was back.to suprised my phone was not fixed they told me because the screen is broken they cant fix it.do they dont knw if its broken it cnt be fixed...n as the person can i just take my phone and break it im that stupid.....because 90%of us our phones do fall.so that is unfair treatment to customers what must i do with that i left it there at the shop im so angry with that.i need help if its like that why they dont produce produce phones that wont break.they told me im so careless/negligence....for realy maara