Battery cell damaged

Afternoon I bought a battery at Mentioned company in Rustenburg (LBL suppliers pty Ltd)on 26/04/2021. On 07/11/22 I went there it it seems like the battery was not charging- they than check the battery and said it already dead. Meaning 1 cellos gone, I than said to a lady by the name of Sunita if not mistaken - the warranty is 13 months but how possible is it as with my experience at least after 2 years I should understand. She than ask me to I drive a lot and I said not that much for the year I drive more than 20 000km. She just said there is nothing they can do. Invoice number 2550