To unblock OCTO Mobile, contact the Bank CIMB Niaga WhatsApp Call Center at (+62)0818811227), or visit the nearest Bank CIMB Niaga branch to explain your situation. You will be asked to prepare identification documents (such as a KTP) and proof of account ownership. If the block is due to technical or security issues, the unblocking procedure will be simpler. However, if the block is related to a legal case or an order from an authorized institution (such as PPATK), the process will be more complex and require a formal resolution. Please verify the details with the bank branch.