Battery expanding

Good day.I bought a battery For my Toyota camry in November 2017.At Midas Roderpoort jhb. i only used it in December and it started expanding and giving me a smell of acid.I took it back and the Midas told me they wont exchange it because my car has fault .I asked to speak to their manager who they said hz no available he wll only come next week.they sent me to Their heard office in Florida wher i explained to them what happend .they also told me that my car is over charging.i asked them tho test it whch they did.and the results showed that there s nothing wrong wth the Car.But they still refused to change the battery.They told me i must buy another one as it is not their fault.Plz help me get back my battery or my money back.because thers is something wrong wth their battery