Have you violated some terms? Or they do ask out for some verification for you to be able to withdraw? I havent checked out the site but i have check their KYC policy.

A valid government-issued photo ID (passport, driver’s license, or national ID card).
Proof of address, such as a recent utility bill or bank statement.
Verification of your payment method, such as a photo of your credit card or a bank statement.
These documents are required to verify your identity, confirm your account details, and ensure that transactions are processed securely. All information provided during the KYC process is handled in strict confidence and stored in compliance with data protection laws.

Source: https://gamblits.com/page/know_your_customer_kyc_policy/