I sent an email to them asking why I cant withdraw, stating that I ave multiple logins. I told them that I have not even register as I am an old user, I only put my bitcoin address and mining starts right away. They could not even explained and responded to my email saying that they don't need to explain and the recent response got is saying disgraceful language. I have all the email conversation we had with then and surely they are part of those who victimize people online and asking them to upgrade before you can withdraw.
I was warned before that this is another scheme of fooling people but I did not listen. I even invited several friends and I got more than 150+ referrals but in the end I have tested and proven that they are not to be trusted, tested and proven by me. Email threads are unethical and unprofessional.
Careful to those who will upgrade because you might end up loosing your money instead of gaining.