4) NO account used the same addresses or applied to all the campaigns closely, so was it enough to say that these 3 accounts are alt accounts?
Absolutely not! But having an alt account would mean having individual wallet addresses for each account. I can't say neither of you were on the wrong but, you (as the victim, probably) should provide concrete evidence that the accuser is wrong and you're right. Unless this is provided, the DT member who tagged you would probably just ignore you.