JUST HELP ME PLEASE

I bought a brand new Galaxy A5 the 28/08/2015, I had to send it back for repair the 10/09/2015 (13days apart) beacuse the screen just went black. I got my phone back the 12/10/2015 (32 Days apart) in that 32 days, it took me to phone everyday for them to sen in my phone because everytime i called this was the excuse: 1. We sent your phone in, it will be back in 4days 2.Sorry your phone is'nt send in yet 3.Are you sure you havnt come and fetch your phone, its not in the store anymore etc. Now today is the 5th November , I have to send in my phone again , because when people call me , i can hear them, but they cant hear me, I honestly think I got a manufacture phone that wasnt sepouse to sell, I am in tears, I have more debts than I can count, now a 3 month old phone, that I bearly had with me for a month, is broken again, and its not even my fault! also at the begining when i got my phone, my caller ID worked when poeple phoned me, now recently aswell when poeple started phoning me, it showed unknow the whole time, all of the sudden when i took it today, the lady said it was never activated, I have to pay an ekstra R9 a month for it.Please help me, show me how good the poeple say ur