https://techcrunch.com/2018/01/20/telegram-ico-scammers/
Its a scam. The real ICO is supposed to start in March.
I just checked the "Contribution" addresses. Their BTC address seems to be a brand new one with no transactions, but their ETH address has quite a number of transactions since Nov 16 2017.
"Sold: 589,832,857 GRAM" indeed.