Public accusations are not allowed. If you have reported an account and it hasn't been closed yet, it could be that the site has not seen the report yet, especially for more obvious cases.
For other cheating reports, it could be the report hasn't been seen, there's insufficient evidence to choose, or the account shows no evidence of cheating.
That all said, discussions of cheating, potential cheating, or cheat detection are not allowed in the general forums.
Is chess com doing enough about cheats? This account - [removed -- MS] is an obvious cheater, created a new account with the country of Kazakhstan, played a couple of matches up to 2000 with a high percentage, then changed to Cape Verde islands and boosted another account and never entered the game again. Just go and see what his account looks like. The second account was banned, but this one remained despite the fact that I reported it a couple of times. There are also cases where I played a game against new accounts who are obviously cheaters, but after my report he no longer entered the account and chess com does not want to react to such one-time accounts.