Hashnest is the best website and is a legit cloud mine, you can't ROI with them either but at least they are backed by Antminer devices, so the mining there is real. I have never had a problem depositing or withdrawing from Hashnest, probably you have sent your transaction with a low fees or there must have been some internal problems at Hashnest.
My transaction is always with higher then then recommended and even to be with low fee when the transaction have more then 6 confirmation and they not show in balance that mean the problem is not in the fee ti e problem is in hashnest !!!