Twombolt cranks making clicking sound?

Okay so ever since 3 days ago when I tightened my cranks today I just rhode my Sunday aaron ross pro bmx and the twombolt cranks are making really friggin annoying clicking sounds and you can feel it too, i just got this bmx 15 days ago and i just went to a bmx shop and they said it could wreck the cranks on the bike if they take it apart and re-grease it or something, it sounded like they didnt know what to do... but anyway... its super annoying and i need to know how to fix it please.