Not just that, some of the buster account using a few indicators went they investigate :

• Same posting style
• Short interval gap time posting ( Cause they just ALT+TAB went making a post)
• Merits cycling between the user
• Log time wake up and participation for the campaign, went a single person see a good campaign and he will activate all their alt at the same time after hibernating and register all of the accounts to the campaign with some short time

Sometimes went they got busted with a few of this, they will say it's my uncle, family, father, sister, brother, mother, an uncle from their uncle xD.

But it would be more good if you found their transaction history who involved in those accounts, your proof will be more strong.

If they feel, the accusation was wrong what they need is just proof it they not really involved in the alt account.