COMPLAIN

I bought a phone A5 colour gold ,in April 2015 the phone started not to switch on and off within a month ,I send it back to be fix at Vodacom shop they told me to send it at Vodaworld off with was not my problem ,however I did send it there myself.the phone was fixed but within 2week the phone had the same problem.i send it back Iam charged the amount of R1044 ,I paid half of the instalment ,within a month my phone started to act up again the same problem the says the will book inn the phone ,when I go back they found the was no fault with the phone. now the phone its blank on a screen cant receive or make calls , how come does the brand new phone be so easly broken within the short space of time . and the treatment I got there was so poor and the manager shouted me infront of every one , he cant do anything for me couse he just following the procedure.i must come back when I change mind ,I don't know on WHAT