I received my deposit of 2 credits, but am unable to withdraw the credits.
You cannot make withdrawals as you do not have a valid deposit.
No where does it state that you must make a deposit before you can make a withdrawal. From your OP:
Minimum Deposit/Withdrawal: 0.01BTC
From your terms of use:
6.6 You acknowledge and understand that separate terms and conditions exist with respect to promotions, bonuses and special offers, and are in addition to this Agreement. These terms and conditions are set forth in bit777.com, or have been delivered to you personally, as the case may be. In the event of a conflict between the provisions of such promotions, bonuses and special offers, and the provisions of this Agreement, the provisions of such promotions, bonuses and special offers will prevail.
8.4 Withdrawals from the player account:
8.4.1 Subject to clauses 8.4.2 and 8.4.4 below, you may withdraw any unutilized and cleared funds held in your player account, by submitting a withdrawal request in accordance with our withdrawal conditions. it is your duty to access the website and review any changes to the withdrawal conditions. On any withdrawal approved by us, and provided that you give us sufficient information as to how the funds should be transferred to you, we will return the relevant funds to you in accordance with clause 8.4.3 (less charges incurred or any required amount from your withdrawal in order to comply with any applicable law).
Therefore, I request the ability to withdraw my 2 credits (0.02 btc).