swollen battery

I am from Mauritius and bought a samsung galaxy s4 (GT-i9500) 4 months ago (september 2014). the battery has now seriously swollen over the past few days and the screen is slightly bulging out. it overheats a lot and drains real fast.<br> The battery S/N starts with AA and not BD as from the various reports.<br> could you please help me find a replacement battery here in Mauritius. I believe the warranty for batteries is of 6 months.<br> Thanks