Edgars West Street Durban,terrible

I bought a cellphone on Friday the 25th September 2015 at Edgars West Street,a Samsung J1. I started using the phone on friday,from that time till Monday it seemed to have abreak signal or something of that sort. Not sure what the problem is but when it rings it breals and when i speak i cany hear the next person. I always have to dial twice when phoning someone.Its tidious and quite irritating for a brand new phone.when i got to the store a person that tested the phone found no problem with it. I was told there is nothing wrong with the phone by a Melusi who also told me to go home because there was nothing he was goin to do for me.He also asked why i didnt come through to complain on the weekend.I struggle to understand what my weekend and comin to ahops has to do with him.The phone is still within the 7Day out of box warranty.He was just plain rude and refused to help me and went to an extent of suggesting if i want them to keep my phone for me at their shop or if im trying to bargain another phone from them. <br> <br> Im so angry!!! HELP!!!