https://www.nicehash.com/attack-learn-more

"We have now been able to reserve the funds required to restore balances from a group of international investors in our business. The exact date of reimbursement for old balances will be announced by January 31, 2018. We need this interim period to ensure all legal paperwork is processed correctly, so please be patient while we do this."

Guess we have to be patient then... but yeah, using more than one service to mine in the future is a good idea. Hoping for the comeback of the project