So i tried to contact them several times.

No answer via E-Mail, Skype Message, Skype Call or Website. Phonenumber of Bitmine.ch is not reachable.

I think this is a really huge scam. Bitmine.ch are scammers and maybe the real owners of 50BTC.com.

Here are the contact datas of bitmine.ch if you plan to travel to switzerland or if you plan to involve a lawyer:

Bitmine AG
Centro la Monda 2
6528 Camorino
Switzerland

Phone: +41 91 290 90 99

FAX: +41 91 290 90 98

E-mail: info@bitmine.ch

Here from the german part of the community that no one got his bitmine.ch hardware: https://bitcointalk.org/index.php?topic=292511.20

So 50BTC and Bitmine AG alias Bitmine.ch is proofen scam. Not responding and not paying.