I often see gamblers being banned by certain gambling site teams/management when taking winnings from bonus results, at the end of the discussion I see users breaking some rules that have been set by online gambling site companies.
Of course we are here, don't know exactly why your account was banned on the trustdice gambling site, but at least you can make a complaint in their official thread here: Topic: TRUSTDICE.WIN: up to $25 FREE BONUS [NO DEPOSIT REQUIRED]

I think the trustdice gambling site, is still acceptable here, although there are some accusations that we see like this case, but I think if you don't break their rules in winning they have no right to ban you, except: something happened to you that we don't know about that harms trustdice gambling company.
but I hope, your case has a meeting point.