If you suspect another member of using disallowed resources you should report them directly to staff.
https://support.chess.com/en/articles/8562517-how-do-i-report-someone
If you have reported someone and they're not closed after a few days then either
- There's insufficient evidence of cheating
- There's no evidence of cheating
Thay said, public reporting or discussions about cheating, potential cheating, or cheat detection are not allowed in the general forums
Why chess.com dont ban him?