worst service ever

so i have been to the repair center in nandi drive durban with regards to the back of my samsung galaxy A3 starting to break of. this phone is one year 5 months old. it has a built in battery. the phone was always in a cover until i noticed that the cover was fitting correctly so i took it off only to find the back cover is starting to come out. i was told just by looking at the phone that it was due to the battery swelling up and that the warranty of the battery is only one year and i would have to pay. apparently i am still lucky that the back cover and front screen has not cracked yet. so i have taken pictures before this starts to happen. and i am not willing to pay for a battery that i cannot see or monitor. i was told to contact JHB head office by the manager of the service center as this was a special and explain to them but it seems the staff is even more *********** and it takes 24 to 58 hours for a callback from there service department to speak to me . this phone can start to crack or even explode and then its another issue. Samsung is always my preferred choice of product and the first time i have ever had a problem with one of my samsung products the service has been very very poor. the JHB head office even tried to push me away to go to vodacom to solve the problem clearly they cant even look after there own product. samsung can come pick this phone up and keep it.