Telkom not resolving faulty phone

I have gotten a new IPhone for my wife on contract early January 2016, it took Telkom almost a week to port her old number (prepaid) to their network. We then found that the handset is faulty. I booked the phone in for repairs, 4 weeks later I get the phone back. Once I was at home I realised that the unit is still faulty. Booked it in... again, waited again 4 weeks for the phone. I tested the phone in store on collection and it still had the same problem. I had to book it in for the third time, the manager (Mbulelo) promised to follow up and see if they can arrange for a swap out and would then contact me.I waited 2 weeks but no contact from Telkom. I went again to the store, and just recieved more promises about following up and phoneing me back.