Angry Customer - Phone always does not have Network

I have been struggling with Vodacom network, I renewed my contact and take A6+ , the worse mistake of my life, I am having nightmare with this phone, it's either showing no network registered or emergency calls only. I have returned in twice Job number ********** 4 and ********** 2, both times i was told my phone will be taken to ARC , but when i receive the phone i am experiencing same problems. This is wasting time as i queue returning the phone, and picking it up, and also i find it cleaned up, i have to use my own data to install all the apps only to find out that the issue is still not received. I bought Mobicel another unnecessary expanse from my side, and it works with my sim card, same area where the A6+ does not work. This is so frustrating, it's either you take your phone back give me a new one or give me my money back. I am emotionally tired and it's really stressing me right now.