EDIT: after making so much noise here and elsewhere for one week long, I finally got my contract activated

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nexusmining.com is SCAM !!
NEVER EVER SEND MONEY TO NEXUSMINING
Paid for hash power 4 days ago in BTC, never got the hashpower, site says the contract is "expired" and they don't answer email.
Wrote them uncountable times, only one answer telling bullshit and received from a gmail account (!)
"live chat" is always offline
Isn't there any way to have authorities bring down the sites of these scammers?