Tired of expensive phoned

In May this year someone bought me a Samsung S6 as a birthday gift. Since then I've had no less than 4 problems with my phone. The first time that battery heated up so much that it practically burnt my hand when I touched the phone. So Samsung replaced it. Then my phone would randomly go off and not come on again until a few days later. Then due to my own negligence I cracked my screen. Vodacom replaced my screen and the motherboard but I bought a tempered glass screen for R500. Now this new tempered glass cracked in my pocket. I was assured of its strength though. Must I now shell out another R500 for something that will cracking in under a month again. I am really not a happy customer and am considering not renewing my contract with Vodacom again.