Please feel free to dog pile on me if I am out of line here, but.......
A machete is not an axe! It is not a saw. A machete can chop through herbaceous plant material as in the jungle, but not to chop coniferous trees that are a much tougher wood to cut through. You are trying to chop a log with a machete, that is wrong. If any company warranties that, then they are going above and beyond the call of customer service.
Thank God you were not hurt. That tip could have flown up and stuck in your noodle. God was looking out for you, and is giving you a redo. Do it right next time, use an axe or a saw, and use your tools for what they are intended.
There is a reason Paul Bunyan did not carry a machete in the timberline, Babe his ox would have made fun of him. Seriously, I am glad you were not hurt, but I think you need an internet spanking for your lack of judgement.