Failed Battery

I bought an Autozone battery on the 5 October 2021, with an 18 money warranty. For the past month we have had to be jump started 3 times we have bought a charger and charged it over night and most recently bought a portable jumper kit. I called them today to discuss it and having replaced, they said I have to go there drop off my battery. How do I get home from there and how do i get back there tomorrow after they have done exactly what I have done twice. so they called me back said we can have a once off exchange but that means my warranty will fall away. how do I now know they giving me a new one, why not just continue with my existing one. Very unhappy