Refurbished phone having technical issues

I previously handed in my phone for repairs and was handed in a refurbished phone much to my disappointment, after much deliberation with Vodacom I was forced to take the refurbished phone. The job number is ***2 and the EMEI of the phone I gave in is *** so that you can track the history. 3 months later this phone is now switching off and losing connection so I have to keep restarting it to receive my mail, whatsapp messages and bbm. The socket for the headphone is also not working. I am really frustrated as I can not have a phone that constantly needs to be repaired...I also cannot go to Menlyn customer care as it is too far for me to travel to keep dealing with the same issue. I have complained about this before and had a proper solution be found initially, i would not be sitting with the same problem.