How do I proceed to get him banned or an infraction or something?
I dont expect to get my money back but how can I make it so that others are not scammed by him as well?
He won't be banned as the forum does not moderate scam, but we can tag his account if the evidence that he scammed you is sufficient. Please follow what @goldkingcoiner suggested and make a good report.
Also normalize reading through feedback left by other users before dealing with anyone here. The clues that he would scam you were already there on his profile
I looked at his profile and it says he is a "trusted" seller. What clues am I not seeing?