Faulty iPhone 6

I upgraded my contract 15 days ago and noticed after about a week that the phone was faulty, having to charge the device 3 times in a 24 hour period is totally unacceptable for a brand new device! So I know their policy is to return within 7 days which I didn't because the problems only presented after the 7 day period! So I took the device back and was told it would have to go in for diagnostics tests for 21 working days. Which to me is totally unacceptable, I was given a loan phone, which the technician failed to set up properly causing me to loose all my apps, messages, photos etc. besides the fact that the device is faulty and clearly should be replaced because in the technicians words you cannot repair an iPhone battery I have been extremely inconvenienced with the loss of all my apps etc. This is totally unacceptable. Also the serial number of the device failed to register on any of their systems which is very strange. It also failed to connect to the cell c network constantly saying out of service in all the usual areas that worked perfectly with my previous iphone. This is totally unacceptable service.