faulty chev aveo 2010 model left front tyre

I bought myself a chev aveo 2010 model brand new from cp nel oudtshoorn since i bought the vechile the front left tyre is wearing off and only the front left tyre only after 6 months the tyre was weared off i took it back to the dealer they could not find the fault its 2016 now the car has been in and out of cp nel hundreds of times but the fault could not be fixed till this day i am on my 4 set of tyres in 6 years and my car only has 85000 kilos on the clock as a customer i am very unhappy i dont want the car anymore my warranty has expired last year but the car still not fixed so it means i have to lay which is alot of bull pls help me to resolve this problem i have spoken to alot of machanics and tbey all say this could be a fa tory fault pls belp me i cant buy tyres every 6 months. My vechile went in for brake shoes the left wheels nuts some of them could not loosen they had to cut it off and replace steange again left wheel i am tired and gatvol