http://ecogra.org/
Ecogra is a regulator that Poker Time and many other Primas are a part of. These type of stories pop up a alot on that network. MG says someone cheated and provide zero proof, zero hand histories and refuse to communicate. The fact the Prima rep here is ignoring inquiries is disturbing as well. From what I've seen of them at 2+2 I'm not too surprised though.
Their profile says they last visited today. Maybe you have a reply waiting, if you don't you're being ignored. Go to Ecogra. If they refuse to provide at least the hand histories then they need to be rogued. This "You cheated but we can't prove it" BS has to stop from Prima. I must say though these type stories are not as common as they used to be which makes me want to see these hh's even more. There must be something in there that raised a flag but the fact they are ignoring the situation makes them look very bad.