Perhaps my assumption was wrong. Sorry about that, bud.
On the bcc app screen you'll see 4 buttons (and a help (?) icon in the top right corner):
Withdraw & Deposit at top
Buy & Sell at bottom
Using the app is a 4 step process:
1. (Deposit): Load MC's currency into app. You'll see it raises your buying power in set increments. Click the (?) icon in the top right corner to change the increment.
2. (Buy): Converts all deposited funds to BCC
<This is where you'd get Bogdan off to pump it>
3. (Sell): Converts all BCC to funds (money sits in app)
4. (Withdraw): Withdraws funds in the same increment as deposit. Again, click the (?) icon to change the increment.
I don't know what's going wrong for you though I would suspect perhaps you did not sell before attempting to withdraw?
Hopefully this helps, man. Sorry for misunderstanding your question earlier.