I agree fully with @kinyonga. You have no idea what you actually purchased much less if it is the right percentage. you do not even know the amount to give for his weight. This is why we all kept saying you had to get him to a reptile vet...
I’m sorry to hear this and for your loss. I hope maybe this has helped you to realize that perhaps chameleons aren’t the best pet for you. Best of luck with your future pet ventures and feel welcome to stick around to continue to learn about their unique husbandry requirements.