You should post all of your contact with the casino on AskGamblers and LCB in the complaint section. You should definitely get back your 1 BTC. It also states that 2 BTC is the MAX cash out for all the first, second and third deposit bonuses. Did they lock your account?
It's a good idea, but I wouldn't put too much hopes on it. The issue has been brought up repeatedly with AskGamblers and they have consistently sided with casinos, even when it's very obviously extremely predatory. It gives me the impression they don't actually care about players or fairness, and just their affiliate earnings. But definitely doesn't hurt to try.
But the real uphill battle that the OP is going to have is that bitcoincasino.us is not a well known or reputable casino, so they have no real reputation to protect.
But I really hope the OP is successful, casinos that prey on their customers really should just not exist.