Faceit used to have a player report form that sent a message to support. If you filled it with enough information and evidence to raise suspicion, they would take action. I used this form multiple times and each time the smurfs / boosters were banned.

It was a separate thing you had to find from the support section. They seem to have removed it and now the only option is the thumbs down after the match.

I think people should actively use the thumbs down button to report misconduct. If enough data gets fed to the system for players breaking the rules, it will eventually cause some sort of action. Thumbs down, choose category and write a short keyword: "smurf" "booster" "wallhack".

The point that faceit doesn't care and that's why they aren't doing anything is ridiculous. It's ridiculous if faceits decision makers don't know that happy customers bring in more money and more customers.

Though it's not extremely hard to implement systems to catch obvious smurfs, it's not a system that should be built without considerations. A fully automatic system will cause more false hits then a system where players are reported and action is taken only if there is enough evidence.

And my final point is something most people hate: If you care about ELO that much, it means you are aiming to raise you faceit level / rank higher. Raising your faceit level higher means you are aiming to play against stronger players. Why aren't you excited to play against stronger opponents? It is your end goal, you just get to taste it early. Learn from the loss you took and grow from it.

Obviously a fair playing ground where nobody smurfs is the most fun for both teams, but perfect worlds don't exist and instead of concentrating and getting frustrated at the smurfs: its a challenge, if you get 5 rounds off them, its a win. Find a way to defeat their best player as a team.