Willard Batteries Poor Quality

I bought a willard battery from best drive 6th Avenue Walmer in Port Elizabeth after a year the battery gave me issues, since it was still under warranty I went back to ask for a replacement. They gave me a battery that needed to be replaced again after 2 months. I went back to them for replacement they claimed they ckaimed my battery is ok the problem was my car. I went to the auto electrician and on testing the battery test report did show that my battery was the issue. Now they refusing to replace the battery even though the warranty is still valid despite tests from other battery dealers showing that my battery is dead, only their battery tester which assume they use to refuse to issue claim is showing that my battery is ok. Now I have to contact their battery supplier myself to ask for a replacement, although I did show them 2 battery tests reports showing that the battery needs replacement. I'm being sent from pillar to post to get assistance to claim.