useless service on phones

In December 2014 i booked my iPhone 5s in with a battery problem while it was still under warranty. My phone was then replaced with a new iPhone 5s. in January or February my phone was booked in again with signal issues at which point i was told a software update was done. i continued to experience problems at which point i booked the phone in again for repairs. the phone was then replaced again for a new iPhone 5s. The new phone is now experiencing the same problems as the last two.<br> <br> I am now requesting that this phone be replaced with a new iPhone 6 as the amount of downtime i have experienced in unacceptable considering i am on one of the highest packages vodacom offers.<br> <br> I have played by vodacoms rules for the last 3 incidents and now will not book the phone in again as each time i am paying for a phone which i have already had 6 weeks downtime with.<br> <br> I now request that vodacom dispatches me a new iphone 6 and then vodacom can do what ever they wabt with this iphone 5s