The frozen balance in your Indodax account can be reused after you successfully cancel the pending buy or sell order. When you place a sell or buy order using a limit order, a certain amount of balance will be temporarily frozen until the transaction is successful. If you decide to cancel the unexecuted order, the frozen balance will be automatically returned to the wallet in your account. This process allows you to reuse the funds for other transactions or withdrawals. To cancel an order please follow this link.