I requested a withdrawal but balance didn't update, why?

Your balance will not change until the withdrawal is processed. You may continue playing if you wish, however, make sure to keep a sufficient balance in your account for your withdrawal to be processed, otherwise, your withdrawal request will be canceled. Withdrawals may take up to 72 hours to be processed.
In the meantime, you can manage any pending requests on the 'Payments' section of your account.