Pleas replace my phone

Received Samsung Galaxy A7 on 30 April 2015.Experiencing problems on a daily/weekly basis ever since.The cell phone will switch off by itself.Will be in a Wi-Fi, but will receive an error message report: can't download app.When I go to the Playstore to install an app, the phone feezez. Another problem is : No Connection.I have been in contact with the company with whom I have the cell phone contract and I had to hand in the phone so that the phone can be send to the repair shop.What a battle due to the fact that the phone switches off by itself, or the message \no connection\" can't download app.Handed cell phone to Samsung Technical Kiosk at Tygervalley branch, again inconvenienced. Problems still not resolved. Sent a request to VOC Samsung, requesting that the cell phone is to be replaced.Once again I had to hand in phone at Samsung Repair Centre.Sat at the Samsung Repair Centre Century City for nearly 2 hours, and after a battle, I received a \"loan phone,not a new one as requested.Firstly, I am sitting with a product that is faulty and secondly I am paying for a service I am not receiving due to a faulty phone. This is not TCF.I just want my phone replaced by a new one"