Willard Batteries - too short life span

<p>Bought a Willard Battery in July 2015. Not even 2 years and my battery is dead and needs to be replaced. I cant find the invoice. what do i need to do to be covered under the nation wide guarantee.</p> <p>whats worst is i have two of them one thats 14 months old and the other im not sure about but have always used willard batteries on all my cars and feel truly let down by them dieing so soon.</p>