Why is good service so difficult for. Odacom

At theend of 2017 I took my phone to Vodaworld repair centre after it went to Centurion repair centre twice. According to them the “hard drive”of the phone was replaced, but I am experiencing the exact same problems. In fact, its a bit worse now. My phone goes off when I am in maps, making a cideo, trying to make a call without the battery being flat. After the “hard drive”was replaced I am surely not supposed to have this problem anymore. It takes time to travel from the north of Pta to Midrand. Youare without your phone for a few days and then you have to drive back to Mirand to collect the phone again. Im sure the least Vodacom can do is to make sure that the problem for which the phone was booked in was at least sorted. I have only had problems with the phone and the service from Vodacom is terrible! I have been a loyal customer for many years, but this level of (no) service is forcing me to consider othef alternatives.