Not quality goods

The first week of march had a problem with the fone ibought from mtn(contract fone) am paying R489&R189 for insurance every month, I first called the store to make some kind of arrangement ,she told me to bring the fone to the store! When I got the Friday during my luch time, she told me they dnt take fones on Fridays mind u she did not that when I called, on the 11th of March 2015 took my fone to the store, they said it will be taken to repairs it will take 2-3weeks to come bck back, I have an iPhone s5,I am unable to do anything can't make calls,can't even unlock the fone the touch pad is not working,it calls on it's own and sends emails to my contacts have to make sure it's locked,I do receive call and msgs cnt look at them,was called after 4weeks to get my fone, was never told it was not fixed,I had to switch it on to see when I went back to the store to ask the lady about it ,she just showed me a box that was written not fixed was so angry went home,called mtn they could not assist me ,they told me to go online and complain,went on line tried to complain but the was place for that,it's frustrating me not having a fone while am paying,it's not even a year,it's only <br> 8months.