Regardless of whatever the buyback situation currently is with the ROCK1 and ROCK2 token (although I'm in favor of the OP here), I think that we can all agree on the fact that Ice Rock Mining is shady at best as a organization.
They literally guarantee you making over 300% per year off your investment, and I fail to see how that can be done without running a ponzi scheme of some sort. Perhaps they'll just pull off the scam as soon as the ICO ends, even.
If they are indeed kicking people out from telegram, then that's another sign of a scam. But honestly, what's on their site alone and their promises should already be enough to say that it's a con.