Yes I joined the multimining site because of all the great reviews it has to me I go by reviews they are very helpful until now with this site. No I do not have a problem with the fees that how they make their money, Just as long as I get my coins.,
Well I would not know because put my withdraw request in on April 3 here it is April 13th and still no word from them when writing them about it. I personally believe its a scam until I see all my payouts and upgrades that I paid to do.
I have no idea unless you are putting the address in wrong maybe missing part of the address. Or who ever you have bit coins in is not letting I just dont know I am so sorry I could not help you
Have good day