This is completely a scam. If you cannot withdraw your money without paying more money then it means your money is gone.
Stop getting fooled by these scammers. They will never give you profit.
I never try it but there's a lot of users sayings that this is fake, honestly I have a lot of doubt regarding to bitminer. That's the reasons why I can't invest and try it, actually there's a lot of people offer it but I always denied it. Thanks to my instinct because I can't grab this scammer, if I greed to earn a lot of money or bitcoin I'm pretty sure that in the future I lost all of it due to investment.
This is entirely a scam and I have tried it. Always it is good to stay away from such kind of cloud mining websites. Till date I haven't come across a much trusted and legitimate cloud mining website. Similar to this is the bitminter which is also a scam.