unacceptable faulty phone and horrible service

On the 17th September 2015 I took out a note 4 contract phone at the store.I was assisted by a very helpful friendly (at that time I suppose in order for him to make a sale )consultant. Today I then went to a store close by to enquire about the problem I have with the phone having to be charged more than 3 times a day as the bettery dies out very quickly and freezes every now and then and to me the phone is clearly faulty . I was then advised to contact the store I took out the phone since its less than 7days to return the phones which I then did.spoke to tshepo who was so rude telling me the phone needs to be booked in for repairs,which I failed to understand as I've only had the phone for 5days. He couldn't give me a proper explanation and was very irritable and asked me what must he do. I was very disgusted in the manner which he spoke to me and calling back the store while I was on the line with customer care to shout at the consultant as to why they advised me that I need to be given a new phone which they did not. He clearly doesn't know CLIENT RETENTION my concern's where not important as the day he gave good service to make his sale