Faulty Battery

I bought and expensive motorcycle battery from Battery Center, Randburg, which was faulty from the start. After testing it on my motorcycle, they said it was a parasitic leak. Unfortunately, I believed them but some months later discovered that the leak was normal and very small, not enough to harm the battery. When I took it back they could see it was their battery but would not replace the battery unless I produced the invoice i didn't have. So I need to replace a battery less than a year old. Buyer beware.