Hiking - short sleeve shirts

I bought an expenisve Mammut hardshell jacket which now needs repairing again. I bought it because I thought it came with a limited lifetime warranty - I'm absolutely certain of this and remember reading some of the terms and conditions. However, Mammut don't believe that this ever existed and their website now redirects to a different page with a new shorter warranty. The weird thing is that I can't seem to find anyone else online that has had a similar problem - does anyone r...