You should usw the standard format, see the pinned threads, and then accuse them.

I feel really sorry for you my friend and 7 BTC is a huge amount and dont know what cloudbet are trying to do.I am using cloudbet since around an year and i dont think they are scam site.Yes there are some issues in their site that needed to be fixed,but cant tell about your problem bro,the only thing you can do is to wait more which is not easy i understand if your 7btc are stuck somewhere.

I also thought cloudbet are legit sites and never scam but listening your story doesnt sounds good but i still feel they will not scam and you will get your withdrawal some day.

Okay. So what actually happened?
You won on a game and when you tried to withdraw, your account was frozen instead?

Was there any reason stated other than 'suspicion of fraud' and 'under investigation'?
Also, any updates from support?

*Their support is quite horrible. They could take weeks.
*And yeah, I saw from their main thread, reaching out to Dan/cloudbet doesn't help. lol.
*I suggest leaving a feedback about their support(lack).

Goddamn Cloudbet. Time and time again with so many complaints so far why anyone actual keeps funding these fools is beyond me seriously!
So now if you win a substantial amount (I would imagine any amount over 1.6BTC=$500) and try to withdraw your winnings they freeze your account and come up with any excuse possible to to tell you that you are under investigation for attempting to commit fraud?
What kind of competent business does this and continues to operate?
That is why they run their half-assed operation in these countries that do not give a rat's ass about laws against imbezelment or money laundering like these poor ass Central and South American places that end up paying off their political officials to look the other way while they continue to steal money from their unsuspecting customers.
For shame Cloudbet. You will be running off soon and shutting your doors. So there will be more crying going on here. This is a promise to anyone still using this pathetic excuse for a casino operation that has ever existed!

My account is still blocked!!! Cloudbet - SCAM!!!

Its more than 3 weeks but cloudbet is silent about this issue and not replying on this thread about their service.

And why such gambling site always need some personal information if someone need to withdraw big amounts or the account have huge amount  balance from their site?  

Mods here in bitcointalk should take an action about this issue.

IMO op should pm some dt list member, like cryptoevil and so forth.

I think it is funny when cloubdet.com (an illegally gambling site) claims to freeze your account for righteous reasons.  They are an illegal site, and all they are doing is figuring out who they can steal from, and whose coins they can steal, and they are good at it.  The percentage of people whose coins they still is right around 10 percent. That is 1 out of every 10 people.  It is perfect. The other 9 come on here, and defend the company, and that 1 person who comes on here and tells their story looks like a lunatic on these sites.

Don't gamble with this site. If it looks like a duck, and if it smells like a duck, it is a duck. Cloudbet.com has way to many negative reviews to be a legit site. Just take some time and go online and read about them. This is a bad gambling company that steals your money.