Well anyway the whole thing is weird, so my question now is....
@gtg is the @gtg.witnesses account yours?

Thank you for bringing that to attentoin.
Of course not. I'm sorry for replaying you late, but I do not really track mentions on Steem, so it's far better to contact me directly on steem.chat, as Gandalf
On Steem I use only @gtg and @gandalf accounts.
I wrote post recently about such scam attempts.
It's very important to keep your keys safe.