Phone not registered!!!!!

I bought a Samsung Trend Neo on 28/08/2015 and 2 months later the phone is giving me problems with the speaker, I cant hear anyone on the other line. I take my phone to Cresta mall(02/11/2015) at the vodacom shop as I was instructed to do so after 7 days if the phone gives me problems. I get to vodacom and vodacom does not recognize my phone on their system and so I was told to take the phone back to Jet and I did so, I get to Jet and waited there for 5 hours while they try to figure out to which network my phone belongs to, finally they find that it indeed does belong to vodacom. I am then sent back to Cresta the following day (03/11/2015) but vodacom still does not recognize my phone so I went back to Jet and left my phone with my details there, later during the day a woman calls me and tells me to take my phone to the Samsung store in Roodepoort because if Jet takes it back it would be returned to me after maybe a month or 2.<br> I don't understand why I am the one going back and forth with this phone while its still under warranty. I am now left phoneless and incurring expenses because its not my fault that vodacom does not recognize my phone.<br> I need my phone fixed