Does Taeyeon even have a twitter? Really the only way to get your questions answered is via fansign unless they're a much smaller group. Actually NCT does come on twt to answer questions but they're the only SM act I know of that does
not entirely, no. I guess you could try to make an inquiry to the company they are signed under with the help of an attorney to help word the letter for maximum effect but I don't think you can "for sure for sure"