Rampant cheating...what is happening

I had a real bad one just now where I unloaded a whole clip into a seer that had his back to me, had white armor on and the damage from the flatline did multiple headshots with damage in the 200s meaning this was a definite knockdown (the seer was in a bad spot and could not shoot back no matter what) and all he did was turn around and look at me without shooting and I was dead (the autokill patch).

I didn't expect to win this match and I made it into the top ten, but it upsets me a troll that's only there to upset people and not even enjoy the game just threw me out of a match that was getting fun.  I had good armor and weapons in this one and was enjoying the back and forth shoot outs I had done.

A guy said we could report it on here by filling out a form, but how can we prove it on a system like switch lite?  And it's like my brother told me, even if they ban a cheater, the cheater comes back with a fresh account and builds it back up again.  It's sad that there is a group of people out there who only feel good by ruining the fun of others.

As I said before though, part of enjoying apex legends is not playing to win the game, but to have fun and just laugh along with the prankster when stuff like this happens.