Twt Duracell battery Life

Good day.

I am very disappointed in the Duracell battery sold to me by Tiger Wheel and Tyre N1. My car is 8 years old and had the original battery for 6 years. I then went to Twt for a better battery. They told me that Duracell is the best with 30 months warranty. Well, it failed after only 33 month. I phoned Twt N1 City yesterday, just to be informed tough luck. I paid superior money for a less than average battery. It was over R 2 000 rand 33 months ago compared to entry levels at R 1500. 6 Years VS 33 months. I use to buy all my tyres and batteries there.