Not Receiving Any Feedback Whatsoever

My faulty iPad Mini 64GB was taken to iStore Eastgate on 15 March 2016. I was told that it would take 5 working days for the unit to be exchanged / replaced, or at least receiving some feedback regarding the unit. I did not receive any feedback after 5 working days & tried sending emails to the store to get some answers. None of my emails were rep**** to. I was forced to go back to the store to find out what's going on, since the contact number provided is not a direct line to the store & can only be used to make bookings, etc. Upon visiting the store I was told that nothing has been done yet, because I did not have a serial number for the iPad on the purchasing invoice. This was NEVER mentioned before & because of the lack of communication during this time I had to source the needed documents again. Needless to say, I did send the needed documents to the store & still have not received any feedback, even after asking very nicely for them to respond to my request upon receiving the needed documents. I have not been able to have the faulty iPad exchanged that is still under warranty for more than 2 weeks now. Very bad service on iStore & Apple's part.