iPhone 5 disfunctional

Took contract in July 2014. In March of 2015 the phone stopped working took it back to the Autopage in Midrand they informed us that its the battery that was replaced. Upon receiving the device it was still not working and took it back to Autopage. They promised to take it back to their repair centre. In April of we decided to visit the store as the store to get feedback. On many occasions the store was closed. We were once lucky to get the people at the store and their explanation was that there was loadshedding and therefore the store was not open. They informed us that they got a quote from the repair centre and it was the first time we heard of the quote of which we accepted. In May i called the head office and got through an agent who informed that reason the fone was not fixed because i had to pay a repair fee. I then was prepared to pay the fee but was informed that the device is not repaired. I then contacted the MD of the company who promised to look into the matter and appoint someone to sort out this mess and to date we are still waiting on the phone/device with no clear communication.