That's because you weren't actually speaking with Jetwin on Telegram, it was just some rogue scammer. I think the scammer was doing what is called "email spoofing" to make it look like you were receiving an email from the official Jetwin support but in reality you were receiving email from the scammer. That's why this guy was asking you to send him bitcoin and then your login credentials -- he obviously doesn't work for Jetwin.

I know it doesn't look good but just keep at it. I would try to contact them directly through the website if that is at all possible, it looks like they have a Live Chat feature. Perhaps they will one day allow you to withdraw something. Sorry we couldn't have been of more help.