You just need to re-submit your withdrawal request.
Thank you for your understanding!
That's good news to OP and a quick action for the admin, but I have not read on the post an issuance of apology because the error is on your part, and it bothers OP because it's a big amount for many players.
I understand that Betkin is trying to build their reputation and their presence; it will be good if they keep being active here to monitor any issues and their marketing here.