I also have problem with my website link on Twitter.
Filed ticket a month ago and received 0 replies from Twitter support.
Sent email to siteabuse@twitter.com and received also 0 replies.
(I checked spam/junk folders)
Filed new tickets #12219744 #12219461 again and hope to get any feedback.
Flagging good website as malware or spam not only damages reputation of that website, but also shows how bad twitter logic to flag such.