Claim rejected while battery still under warranty

I bought a car battery(Duratec) at the ABE battery Hub centre at Gezina branch in Pta. I bought the battery on the 25/04/2021 and I was told that the battery has 24 months guarantee on it but I have to keep the receipt safe, I went to the battery centre today(30/05/2022)​ after I started to notice that the battery is starting to give some problems. The battery is not working as it doesn’t have power anymore and I’m struggling and​ unable to start my car, I was sent back home after I was told that my car's alternator is faulty as the battery has changed its shape and also was told that the battery died because it was overcharged meaning my car’s alternator is faulty,

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Please assist as I’m not accepting this explanation and the only thing I need is to get a battery that is on a working condition as per the warranty claim. I asked if they can maybe include a clause or something when they sell this products to us so we can make an informed decision. I am now being told to bring my car in at their premises and my car is not in Pta and I am wondering if they going to reimburse my money for petrol or not. I have never brought my car in for inspection the time I bought the battery so now I as the customer must be inconvenienced and be sent from pillar to post after being told I can enjoy the benefits of this battery for 24 months. I believe there was nothing wrong with my money when I​ purchased the battery and so should there procedures be when claiming a faulty battery.