Still waiting for new phone after obf

I have been a customer of Vodacom for the last 12 years. Never before have I experienced such bad service. On the 17th of April we went to Eastgate Vodacom 4U. As my phone was due for upgrade - my wife and I decided to upgrade my phone and get a new contract with the same phone so that next time we can upgrade at the same time. We both decided on the Samsung A3. It was very busy but the service we got was not bad. One of the conditions on the devices is a 7 day OBF guarantee. When we got home we started setting up the phones. My phone did not work and I had to do a factory restore and the memory card slot did not want to open. My wife's phone worked perfectly. I had to charge my phone every 2 hours and my wife's phone lasts 2 days. we returned the phone on 19 April and was sent from the shop to costumer service to repairs and back to the shop. To date we went to the shop a total of 5 times and still we have not received an answer about the phone. This is very inconvenient because we only have one phone at the moment and my wife is without a phone and losing all her data bundle and airtime of her contract. NOT a happy customer.