Stake asked the OP to provide his source of funds statement. They have suspended his account and requested for those documents. OP will be able to access his account again if he can successfully go through the verification process.
This is surprising for all of us, as they only accept profit in mining as the only source of income they can accept in Cryptocurrency when in fact the market is so huge that you can make money in hundreds of ways here in Cryptocurrency, this will not be the last time it will happen because not all gamblers are miners, I believe many of us are traders and investors or developers there is more money to make on these three niches than on mining now, they should have a change of their terms and include other forms of earnings.
Let's see what will be the outcome of this issue, this is interesting to follow.