Vodacom srlls dud phones.

In october last year I got a Sony M4 on my upgrade. I was only really sold because the sales person comvinced me. Anyways to cut a long story short I had to return my first phone the very next day after getting it as it had a fault. So they exchanged it for me under that 14 day guarentee. Subsequently i had to take it in about a month ago as the battery charging port just stopped working. I had to pay for this repair which i did very unwillingly. Now for the 3rd time my phone has just randomly died after getting super hotand this time I dont have time to bring in the phone under its guarentee and to be quite frank i dont want this paper weight anymore. Because of vodacom selling inferier quality phones I have had to previously take hours out of my busy schedule for them.Now time is not not a luxury i have as I am always on the road. I am super disappointed as i have also been a Vodacom user for 10+years.