Username?
What is this

Once , in my club during a VC the members of my club discussed and voted the correct move .The total no. of votes were 6 and all were correct.Ad after around an hour I see that there are another 6 votes by people whose vote was bongclouding ! The thing that makes it suspicious was that all those members who had voted bongcloud joined the club and Chess.com the same day.What is this ?
Report them all

https://support.chess.com/article/209-how-do-i-report-someone
Best is to report accounts incase they are alternate and they can be checked that way.
Once , in my club during a VC the members of my club discussed and voted the correct move .The total no. of votes were 6 and all were correct.Ad after around an hour I see that there are another 6 votes by people whose vote was bongclouding ! The thing that makes it suspicious was that all those members who had voted bongcloud joined the club and Chess.com the same day.What is this ?