Samsung Galaxy S6 Edge

I took my phone in for a screen repair. It took 15 days for them to fix it. I received an sms telling me the phone is ready for collection. On arrival, they told me that they accidently sent my phone to the wrong branch and that I had to go there to fetch it. I went to Moffet on Main to fetch the phone and when they gave it to me, the phone did not work. I had to go up to their repair centre, where I waited about 2 hours for them to try and fix it. Eventually they gave me my phone and told me to charge it properly and that it should work. When I got home, I charged the phone, which only charged up to 70% and then switched off all by itself. I could not switch it back on. I had to go back and sent it in again. Again they had it for 2 weeks to fix. Again I fetched and went home, only to be back for the third time with a phone that did not work. Now it's been with Vodacom for over a week again - still no phone. It is a brand new phone. Contract was 2 months old when I took it in for the 1st time. SUPER dissapointed.